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Machine Prints 3D Copies Of Itself

TaeKwonDood writes "Automated machines have been around for decades. They have basically been dumb devices that do simple assembly tasks. But RepRap takes that a step further because, instead of assembling pre-fabricated parts, it creates 3-D objects by printing them — squirting molten plastic in layers — and then building them up as the plastic solidifies. It works on coat hooks, door handles and now it can even make working copies ... of itself. The miracle of additive fabrication, coming soon to a robotic overlord near you."

83 of 341 comments (clear)

  1. I... by __aardcx5948 · · Score: 4, Funny

    ... for one, welcomes our new self-replicating copy machine overlods.

    1. Re:I... by Gerzel · · Score: 5, Informative

      It can't even print itself as it still requires non-printed parts.

    2. Re:I... by Sebastien_Bailard · · Score: 5, Interesting
      Fussing that RepRap is not 'perfectly self-replicating' yet is an extremely common criticism. This pedantic but factually true statement glosses over the fact that it's a machine that cheaply and easily makes its own parts*, using inexpensive feedstock. And it can make other useful things. That's the important stuff, which your criticism fails to address.

      *Aside from common stuff from a hardware store and an electronics store.

      (Yes, I'm a RepRap developer, and yes, that's a cut-and-paste.)

    3. Re:I... by bestiarosa · · Score: 5, Funny

      You comment to this dupe article is is a dupe of my comment in the original article:

      http://hardware.slashdot.org/comments.pl?sid=514462&cid=22998000

      I for one welcome our new self-replicating Slashdot article overlords!

      --
      :(){ :|:& };:
    4. Re:I... by Anonymous Coward · · Score: 5, Informative

      What it does is print the plastic parts needed to make a copy of itself - you still need steel rods, motors, nuts and bolts, nichrome wire to make the heater core and a handful of small Anduino circuit boards. And of course you have to bolt it together yourself. Pretty soon it should be able to make its own circuit boards - but you'll still need to add electronic components.

      It's a significant step - but the slashdot blurb wildly over-sells it.

    5. Re:I... by LordLucless · · Score: 5, Insightful

      I love the idea of the RepRap as much as the next geek. But it's been posted on Slashdot at least three times that I can recall, and the headline or summary has always claimed, as this one does also, the factually incorrect statement that the "Machine Prints 3D Copies Of Itself". It doesn't. It's cool and all, and it's getting there, but it doesn't.

      --
      Just because you're paranoid doesn't mean there isn't an invisible demon about to eat your face
    6. Re:I... by Fuzzums · · Score: 4, Funny

      Maybe it can print an order form for those parts?

      --
      Privacy is terrorism.
    7. Re:I... by Anonymous Coward · · Score: 5, Insightful

      Perhaps this criticism is extremely common because someone keeps claiming that RepRap is self replicating, when in fact it is not?

    8. Re:I... by dintech · · Score: 4, Funny

      That's fine. I just don't want to see it mating with my toaster.

    9. Re:I... by Anonymous Coward · · Score: 5, Insightful

      First, I love the idea of the RepRap and am seriously thinking of building one.

      But really, claiming self-replication here is only slightly less laughable than someone claiming their inkjet printer is "self-replicating" because it can print the manual that comes in the box.

      What we need is *quantification* - numbers. For example, choose one of the following measures:
      * part count
      * part cost
      * part mass
      * part compexity (harder to measure, but this is what really counts)

      and then find the value of X in this statement:

      "RepRap is X% self-replicating by [measure]"

      My guess is that even by the most favorable measure (probably mass), the number is well under 50%, and by other measures it's under 10%.

      But progress will be made, the value of X will increase, and that's what matters. Publicizing new values of X will attract attention and pique interest. Making unquantified claims of "self-replication" mostly just invites the fussing you're complaining about.

    10. Re:I... by CowboyNealOption · · Score: 2, Funny

      I think the next generation solves the 100% replication problem by hacking into the internet, stealing someone's credit card, and ordering all the needed parts.

    11. Re:I... by fugue · · Score: 2, Interesting

      If it can really print itself, the cost of replication goes down to the cost of parts. This is starting to sound a lot like the GPL's provision of distribution for the cost of media. Are we about to see GPLed hardware?

      --
      "The biggest problem with communication is the illusion that it has taken place."
    12. Re:I... by zacronos · · Score: 5, Funny

      Perhaps, in lieu of making copies of itself, it just dupes articles about itself on /.

    13. Re:I... by thePowerOfGrayskull · · Score: 4, Insightful

      "The amazing thing about a dancing bear is not how well it dances, but that it dances at all. "

    14. Re:I... by Anonymous Coward · · Score: 2, Insightful
      Sebastien,

      Fussing that RepRap is not 'perfectly self-replicating' yet is an extremely common criticism. Stop repeatedly claiming it, and we'll stop calling you on it. It's not printing a 3D copy of itself, it's building some basic infrastructure which can make up a new instance of the object.

      Similarly flimsy reasoning allows me to argue that my workstation setup can "print copies of itself" because I have a printer that can make nice big Apple logos that look not unlike the one on the front of my iMac.

      it's a machine that cheaply and easily makes its own parts The human body cheaply and easily makes its own parts. Unless you're announcing in the most roundabout way possible that your wife had a baby, please give it up.

      Yes, I'm a RepRap developer Yes, making your incorrect claim repeatedly is not doing you any favours. The ability to build 3D models is cool and all - though far from new - and I applaud your excellent progress as amateur enthusiasts. But the claim that gets you headlines is completely overstating your project's abilities, and will stop people taking you seriously and understanding the actual value of your work.

      *Aside from common stuff from a hardware store and an electronics store. I have the keys to the universe in this box*.

      * Alas, the box is locked.
    15. Re:I... by pac109 · · Score: 2, Informative
    16. Re:I... by Carnildo · · Score: 2, Informative

      Does the RepRap team have the driver and CAM software made?...


      Yes, they do. They're using a modified version of the open-source Art of Illusion 3D modelling software for this.
      --
      "They redundantly repeated themselves over and over again incessantly without end ad infinitum" -- ibid.
    17. Re:I... by Carnildo · · Score: 2, Informative

      Give it a different printhead, and it will be able to lay down patterns on a blank circuit board.

      --
      "They redundantly repeated themselves over and over again incessantly without end ad infinitum" -- ibid.
    18. Re:I... by KutuluWare · · Score: 2, Funny

      If that's the case then it's been around for years and isn't really that big a deal. :x

  2. One step closer to the robot invasion by winterphoenix · · Score: 5, Funny

    While I appreciate the commercial benefit of this technology, the geek in me is a little more interested in the advancement toward the robot invasion. And by "interested" I meant "excited."

    --
    I have the heart of a child. I keep it in a jar
    1. Re:One step closer to the robot invasion by cpricejones · · Score: 2, Funny

      didn't you see stargate sg-1? we're not in the reality that has met the asgaard yet either ...

  3. Dupe! by RMH101 · · Score: 4, Informative

    Haven't I heard this before?

    1. Re:Dupe! by Anonymous Coward · · Score: 5, Informative
    2. Re:Dupe! by Yvan256 · · Score: 5, Funny

      Great, now even the articles are making copies of themselves!

    3. Re:Dupe! by NoobixCube · · Score: 3, Informative

      It is a dupe, but when we saw it last, I think it was only theoretically capable of self replication. From the look of the summary, it may actually be capable of it, now. I haven't read the article yet. I came straight to the comments to see if it wasn't just me thinking I'd seen it before.

      --
      Admit it. You post strawman arguments as AC so you get modded Insightful for refuting them, rather than Troll
    4. Re:Dupe! by Anonymous Coward · · Score: 4, Funny

      Great, now even the articles are making copies of themselves!

    5. Re:Dupe! by jonaskoelker · · Score: 2, Insightful

      And I for one welcome our no longer just theoretically feasible new self-replicating plastic robot overlords. I'd like to remind them that as a trusted slashdot personality, I can be helpful in rounding up others to toil in their underground plastic caves.

    6. Re:Dupe! by lilomar · · Score: 3, Informative

      The RepRap blog announced replication several days ago. This is the first time that the machine has been capable of doing this.

      --
      The creator of this post (Jacob Smith) hereby releases it, and all of his other posts, into the public domain.
    7. Re:Dupe! by harry666t · · Score: 4, Funny

      | sed s/articles/posts/

      # the copy is never exact.

    8. Re:Dupe! by fifedrum · · Score: 2, Informative

      but it's still not duplicating the metal parts and the circuits required to drive the copy so it's not duplicating itself so much as printing off plastic casts of parts for a duplicate to use, significant difference between the two states.

      a) perfect working copy
      b) partial copy

      don't get me wrong, it's an awesome device and hell who couldn't use a rapid prototyper at home? I know I could!

    9. Re:Dupe! by renoX · · Score: 4, Informative

      The news here is that it has achieved 'self-replication' (between quotes because the replication is only done for the plastic parts).

      The article gives little detail beside the price of the parts: how much time is necessary for the self-replication? what are the skills needed for the assembly?

    10. Re:Dupe! by swatthatfly · · Score: 2, Funny

      I heard that before.

      --
      keyboard not found! press any key to continue...
    11. Re:Dupe! by kcelery · · Score: 2, Funny

      The article itself makes its appearance in slashdot every six months.
      The RepRap itself actually does not replicate anything useful.
      It would attract more audience if the inventor does not insist the
      self replication feature. By replacing the ugly clear glue with hot
      flowing chocolate, the machine will be 100 times more welcomed. Then
      of course, cold air jet is needed to set the hot molten candy.

    12. Re:Dupe! by STFS · · Score: 2, Funny

      Great, now even the comments are making copies of themselves - and mutating... so eventually we must get intelligent... uhm... comments?!

      --
      You don't think enough... therefore you better not be!
    13. Re:Dupe! by BACPro · · Score: 2, Funny

      Great, now even the comments are making copies of themselves!

    14. Re:Dupe! by FeepingCreature · · Score: 4, Funny

      Great, now even the jokes are making copies of themselves!

    15. Re:Dupe! by Tanktalus · · Score: 2, Funny

      I think the proper meme response is, "You must not be new here."

    16. Re:Dupe! by dkleinsc · · Score: 4, Funny

      You're in a maze of twisty little comments, all alike.

      --
      I am officially gone from /. Long live http://www.soylentnews.com/
    17. Re:Dupe! by spacefiddle · · Score: 2, Insightful

      Great, now even the moderations are making copies of themselves!

    18. Re:Dupe! by Plaasjaapie · · Score: 2, Informative

      how much time is necessary for the self-replication? Vik Olivier, a core development team member living in New Zealand, printed upthe first full set of Darwin parts in his spare time in about a month. Chris Palmer in the UK, another core development team member, reported this morning that he has printed out about 60% by mass of a full parts set in 72 hours of actual printer operation.

      what are the skills needed for the assembly? You can buy a fully assembled Darwin 3D printer sans the control boards from bitsandbytes.com in the UK. The control boards can be purchased from the Reprap foundation (rrrf.org) in the US. The chips and other bits that go on the boards can be got from places like mouser.com among others. The foundation is planning to offer full parts kits for the boards before too long, I'm told. It is only a matter of time, imo, before some robotics shop or six start offering fully assembled and tested control boards as well.
  4. Sweet by Ninja_Popsicle · · Score: 5, Insightful

    This is take piracy to a whole new level. What fun.

    1. Re:Sweet by NoobixCube · · Score: 4, Insightful

      Can't wait to print off some Gundam models from 3d model files, instead of shelling out for the expensive model kits :P.

      --
      Admit it. You post strawman arguments as AC so you get modded Insightful for refuting them, rather than Troll
    2. Re:Sweet by OeLeWaPpErKe · · Score: 4, Informative

      Won't work with this machine unfortunately ... it lacks a support material, so it can only print a certain, very limited class of 3d shapes.

      In fact it can't print any structures that won't retain their shapes when melted to, say 5 degrees below their melting point.

      The safe class of objects that it can print are those that are basically straight-up walls upon a flat base. The most complex stuff it would be able to print is a gothic castle (the ones with tiny windows), and you'd have to put the roofs on top of them afterwards.

      The "full" class of objects it can print are those where a finite element stress analysis (*with* gravity active obviously) doesn't have any red spots.

      (and now translation from technobabble to bad news :)

      It can't print Gundam models. At least not directly. For a less limited class of objects you could make 2 half-negatives, allowing you to mass-produce them. You'd have to paint them afterwards.

    3. Re:Sweet by nicklott · · Score: 2, Informative
      I neither know what a Gundam is nor know how this machine works, but on the reprap site it says:

      There are two heads to allow a filler material to be laid down as well as the plastic. This filler is used to support overhanging parts of the objects being built, and is removed when the process is finished Which leads me to believe that it can in fact make Gundam models.
  5. Close but... by Smidge204 · · Score: 4, Informative
    ...not quite there yet.

    FTA (emphasis mine):

    The materials, plus the minority of parts that the machine cannot print, cost about £300. It also does not actually assemble the parts it creates. So close and yet so far.
    =Smidge=
    1. Re:Close but... by NightWhistler · · Score: 5, Informative

      From the pictures in the article it seems to mostly consist of small metal pipes, with pieces of plastic connecting them.... from what I gather it's only able to print the plastic connection parts, so I'm not sure how this counts as "self-replicating".

      Also it has a big bunch of wires coming out the back, which I bet are not replicated either... so someone was jumping the gun a bit while writing this article :)

      Still... this is some seriously cool technology... if the resulting plastic parts are strong / durable enough it could certainly have a huge impact... essentially being able to download physical objects from the internet...

      --
      PageTurner Reader: open-source e-reader for Android with cloudsync. http://pageturner-reader.org
    2. Re:Close but... by smaddox · · Score: 3, Interesting

      The picture makes the child device look like a cheap piece of crap. But, i guess if it works, who cares.

      I would galdly pay $300 to build on of these if it could build new plastic caps for the back of remote controls.

      There are so many little pieces of plastic that break and make a product useless. If I could replace them after an hours work, I would be sooooo happy.

  6. Working copies you say? by elguillelmo · · Score: 5, Funny

    I have some old Natalie Portman's pics to print out!

    --
    Dawkins Revisited: A person is shit's way of making more shit -- Steve Barnett, anthropologist.
    1. Re:Working copies you say? by JustOK · · Score: 2, Funny

      it uses hot plastic, not hot grits

      --
      rewriting history since 2109
  7. Bad business model by stoofa · · Score: 5, Funny

    Won't everyone just buy one, make it clone itself and then send it back for a full refund?

    1. Re:Bad business model by lilomar · · Score: 5, Informative

      The guys who designed this thing aren't a business. They put the design online and the list of parts online for free, and tell anyone who wants to make one for themselves, then print one off for a friend, who can make one for his friend....

      --
      The creator of this post (Jacob Smith) hereby releases it, and all of his other posts, into the public domain.
    2. Re:Bad business model by smellsofbikes · · Score: 2, Interesting

      You joke, but in the woodworking industry companies make enormously sophisticated jigs for production of wooden forms with repeating features, and at least one company has sold their jigs with EULA language specifically prohibiting using it to duplicate itself or make other jigs that allow its functionality to be duplicated, AND prohibit resale of the jig. Completely bogus, obviously, but they've gone after people with civil suits for violating the EULA and gotten settlements, I've heard.
      So, yeah, people are already trying to figure out how to force profitability on things that can self-replicate in a limited sense.

      --
      Nostalgia's not what it used to be.
  8. God I want one.. by CFBMoo1 · · Score: 3, Informative

    All the times I've owned something and one annoying plastic part breaks ruining the product. With this baby it'd be so easy for companies to send replacement parts at a fraction of the cost I bet.

    If I still had my old Dell laptop I'd print the latch that broke off a few years ago.

    --
    ~~ Behold the flying cow with a rail gun! ~~
  9. This machine replicates itself ... by can56 · · Score: 2, Informative

    and stories about itself on /. Didn't we have an article/discussion a few days ago, and figured out the only thing this 'self-replicating printer machine' does is make copies of its case?

  10. Ahh, but... by Doug+Neal · · Score: 5, Insightful

    Can it sniff out nearby objects/people, ingest them, shred/melt them down to create new raw materials for buildling copies of itself? Thought not. We're safe... for now...

    1. Re:Ahh, but... by the_humeister · · Score: 2, Funny

      No, but my cat can. I also think she's trying to kill me...

  11. One of best marketing statements ever: by tyler.willard · · Score: 4, Funny

    'Recently, Chris DiBona, Open Source Programs Manage at Google Inc, encouraged people to: "Think of RepRap as a China on your desktop."'

    1. Re:One of best marketing statements ever: by ShiNoKaze · · Score: 2, Funny

      I don't see how you get lead paint out of a plastic susbstrate though...

  12. How did they make the first one? by stoofa · · Score: 2, Funny

    I am assuming that they used another method to make the very first one or else philosophers are going to rake it in for years over where the first one came from.

    1. Re:How did they make the first one? by maxume · · Score: 2, Funny

      It all started when some guy rubbed some sticks together or carried away some of the remains of a lightning fire. Later, someone found some metal. Much later, organic chemistry was born.

      --
      Nerd rage is the funniest rage.
    2. Re:How did they make the first one? by Welshalian · · Score: 2, Funny

      I am assuming that they used another method to make the very first one or else philosophers are going to rake it in for years over where the first one came from. You're very clever, young man, very clever, but it's self-replicating machines all the way down!
  13. Let the Clone Wars Begin by totallydude · · Score: 5, Funny

    Lord Vader our troops are almost ready but I gotta run to staples to get some more of that plastic injection stuff for the printer.

  14. you silly robotic overlords by circletimessquare · · Score: 3, Funny

    you haven't thought your cunning plan all the way through

    you forgot the part about who plugs you into the wall

    who's in control now biatches!

    --
    intellectual property law is philosophically incoherent. it is your moral duty to ignore it or sabotage it
  15. Printcrime by Cory Doctorow by skware · · Score: 4, Insightful

    Printcrime

    Copy this story.

    (originally published in Nature Magazine, January 2006)

    Cory Doctorow

    The coppers smashed my father's printer when I was eight. I remember the hot, cling-film-in-a-microwave smell of it, and Da's look of ferocious concentration as he filled it with fresh goop, and the warm, fresh-baked feel of the objects that came out of it.

    The coppers came through the door with truncheons swinging, one of them reciting the terms of the warrant through a bullhorn. One of Da's customers had shopped him. The ipolice paid in high-grade pharmaceuticals -- performance enhancers, memory supplements, metabolic boosters. The kind of things that cost a fortune over the counter; the kind of things you could print at home, if you didn't mind the risk of having your kitchen filled with a sudden crush of big, beefy bodies, hard truncheons whistling through the air, smashing anyone and anything that got in the way.

    They destroyed grandma's trunk, the one she'd brought from the old country. They smashed our little refrigerator and the purifier unit over the window. My tweetybird escaped death by hiding in a corner of his cage as a big, booted foot crushed most of it into a sad tangle of printer-wire.

    Da. What they did to him. When he was done, he looked like he'd been brawling with an entire rugby side. They brought him out the door and let the newsies get a good look at him as they tossed him in the car. All the while a spokesman told the world that my Da's organized-crime bootlegging operation had been responsible for at least 20 million in contraband, and that my Da, the desperate villain, had resisted arrest.

    I saw it all from my phone, in the remains of the sitting room, watching it on the screen and wondering how, just how anyone could look at our little flat and our terrible, manky estate and mistake it for the home of an organized crime kingpin. They took the printer away, of course, and displayed it like a trophy for the newsies. Its little shrine in the kitchenette seemed horribly empty. When I roused myself and picked up the flat and rescued my poor peeping tweetybird, I put a blender there. It was made out of printed parts, so it would only last a month before I'd need to print new bearings and other moving parts. Back then, I could take apart and reassemble anything that could be printed.

    By the time I turned 18, they were ready to let Da out of prison. I'd visited him three times -- on my tenth birthday, on his fiftieth, and when Ma died. It had been two years since I'd last seen him and he was in bad shape. A prison fight had left him with a limp, and he looked over his shoulder so often it was like he had a tic. I was embarrassed when the minicab dropped us off in front of the estate, and tried to keep my distance from this ruined, limping skeleton as we went inside and up the stairs.

    "Lanie," he said, as he sat me down. "You're a smart girl, I know that. You wouldn't know where your old Da could get a printer and some goop?"

    I squeezed my hands into fists so tight my fingernails cut into my palms. I closed my eyes. "You've been in prison for ten years, Da. Ten. Years. You're going to risk another ten years to print out more blenders and pharma, more laptops and designer hats?"

    He grinned. "I'm not stupid, Lanie. I've learned my lesson. There's no hat or laptop that's worth going to jail for. I'm not going to print none of that rubbish, never again." He had a cup of tea, and he drank it now like it was whisky, a sip and then a long, satisfied exhalation. He closed his eyes and leaned back in his chair.

    "Come here, Lanie, let me whisper in your ear. Let me tell you the thing that I decided while I spent ten years in lockup. Come here and listen to your stupid Da."

    I felt a guilty pang about ticking him off. He was off his rocker, that much was clear. God knew what he went through in prison. "What, Da?" I said, leaning in close.

    "Lanie, I'm going to print more printers. Lots more printers. One for everyone

  16. Doom! Doom! Doom! by Detritus · · Score: 5, Funny
    Now all it needs is an attachment that converts organic matter into chemical feed stock and some wheels.

    "Knock, knock"
    "Who's there?"
    "Candygram"
    "You're not a self-replicating cybernetic organism?"
    "No, ma'am"

    --
    Mea navis aericumbens anguillis abundat
  17. Star Trek Replicator by sm62704 · · Score: 3, Interesting

    The self-printing machine is another step to Star Trek's "matter replicator". Society will have some sweeping changes when physical property is as easy and cheap (or beer-free) as intellectual "property" (imaginary property) is to replicate.

    Someone in an RIAA/MPAA thread said that since physical property was getting cheaper and cheaper to manufacture and took less and less people to make that we need to stake our future to IP. I say this is hogwash - I may be creative, but most people aren't.The record labels are already quaint anachronisms, and the movie studios will soon follow as the cost and necessary technical expertise drop. It no longer takes lots of gruntwork to make an album; the band and a guy running the studio is all you need now. What will those who have no creativity do for a living?

    Heaven on earth is on its way and technology is bringing it here. And the greedy rich are fighting its arrival tooth and nail. Their sense of entitlement and feelings that they are better than the rest of us is sickening.

    --
    mcgrew's razor: Never attribute to stupidity that which can be explained by greedy self-interest
    1. Re:Star Trek Replicator by sm62704 · · Score: 2, Insightful

      Food is already self-replicating.

      --
      mcgrew's razor: Never attribute to stupidity that which can be explained by greedy self-interest
  18. Re:Molding by sm62704 · · Score: 2, Funny

    No one mentions the amount of work you have to do with a razor to make it look right.

    You could say the same thing about womens' legs.

    --
    mcgrew's razor: Never attribute to stupidity that which can be explained by greedy self-interest
  19. Obligatory Futurama by Bwian_of_Nazareth · · Score: 5, Funny

    And it can make other useful things. That's the important stuff, which your criticism fails to address. Fry: Isn't that the machine that makes noses?

    Professor Farnsworth: It can do other things, why shouldn't it!
  20. Self-replicating? Not by a long shot by Alwin+Henseler · · Score: 3, Interesting

    from what I gather it's only able to print the plastic connection parts, so I'm not sure how this counts as "self-replicating" It doesn't. I'd say you can call something self-replicating if it can reproduce itself using only the essential raw materials. In this case: plastics, metal(s), energy. Perhaps a lot more ingredients, but at least those.

    A good comparison is reproducing an OS in a Linux-From-Scratch style (using only source code, disk space and CPU cycles). *THE* thing you need is a C compiler. But to run that, you need a kernel, and a C library below. Then you need shell scripts to automate it, thus a shell. Most sources include makefiles, therefore you need 'make'. And bigger components use all sorts of preprocessing utilities like awk, lex, sed, grep, and so on. All these programs use a variety of standard utilities for copying/removing files, creating directories, etc. So before you get 'full circle', you need a pretty big set of things to reproduce what you start with (think of a compressed Gentoo stage 1).

    Maybe this would be a good idea for an X-Prize kind of challenge: create a factory that makes *any commodity of choice*, and keeps itself working indefinitely using just the raw materials, and energy. That is, repairs/rebuilds machines if they break, does maintenance, etc. Say that the only role of humans would be to hit the 'on' switch, stock up supplies/energy, and to keep roof & walls of the building in place. I suspect that even for the simplest kind of product, the minimum size for such a factory would be *huge* if you include stuff like electronics (create new IC's from raw silicium to replace failed ones).

    Perhaps all the required technology to do this already exists, but we're still a long way from putting all those parts together.
  21. Singularity? by tobiasly · · Score: 3, Funny

    Hmm, I thought the singularity would be more impressive than this. I bet Singularity 2.0 will be awesome.

  22. Re:Close but no cigar... by ortholattice · · Score: 2, Interesting
    Whether a machine is considered self-reproducing or not is somewhat subject to interpretation I suppose. Similar issues arise with quines (self-reproducing programs). For example, consider the classic C quine,

    char*f="char*f=%c%s%c;main(){printf(f,34,f,34,10);}%c";main(){printf(f,34,f,34,10);}
    For me, this is not a true quine, because there is no "#include<stdio.h>". It will not compile on typical C compilers. (There are longer quines that do have the include.)

    Basically, you have to agree on a starting environment and what "self-reproducing" means. Computer viruses might be argued to be better quines than a program that simply prints itself and requires a human (or another program) to take the output and run it again.

    Similarly, one might demand that a true self-reproducing machine be able to reproduce itself in the middle of the desert with only the sand as raw material and sunlight for energy. But most people would accept something in between that and the machine described in TA.

    Self-reproducing lifeforms have similar issues. It is possible for a very simple "lifeform" with only 54 base pairs to be self-reproducing, but only if it parasitic. On the other hand, the simplest known lifeform that can reproduce independently is the Mycoplasma genitalium bacteria with 582970 base pairs. This probably isn't the simplest one that can theoretically exist - it is hard to imagine the right combination out of 4^582970 appearing at random in the pre-life organic soup - but whatever simpler thing existed before it is a mystery.

  23. Video of RepRap by OtherFarm · · Score: 2, Informative

    A video of Adrian Bowyer's RepRap can be found at ofpblog.

  24. Comment removed by account_deleted · · Score: 2, Informative

    Comment removed based on user account deletion

  25. Re:Nope, don't think so... by smaddox · · Score: 2, Insightful

    Cutting a metal cylinder is easy with a saw. Gluing into the plastic housing is easy with a clamp. Wrapping wire for a engine is easy, as is buying one online for a few bucks.

    The point is we have an easy way to make plastic parts that otherwise would have to be special ordered. This would complete any garage as a prototype fab. It would be amazing for lab work in which I always want a piece of plastic of a certain shape, but end up having to wait a week to get it made out of much more expensive metal in the machine shop.

  26. Re:Molding by distilledprodigy · · Score: 2, Funny

    You see... When a man and a woman like eachother... Well... Go ask your mom upstairs, you've been in the basement too long my friend...

  27. Toxic? by GreatRedShark · · Score: 2, Interesting

    What sort of molten plastic does it use? Does it start in a liquid state and then dry when it's exposed to the air? Or does it melt solid plastic and then reshape it? I had thought that molten plastic would result in some nasty, maybe toxic vapours. Anyone here know for sure?

    1. Re:Toxic? by smellsofbikes · · Score: 3, Informative

      It uses polylactic acid, which is thermoplastic, not thermosetting: the machine melts it and prints the droplet of hot material, which then freezes solid. Apparently it can also print stuff that stays somewhat flexible after printing, for softer items.

      There are plenty of molten plastics that don't degas much, and there are some that are incredibly toxic. I haven't found anything about PLA yet, but I know a bit about lactic acid and it shouldn't be the health risk that, say, the stuff coming off melted polyvinyl chloride would be, or any nitrile-containing polymers. Molten nylon's not too bad, though.

      --
      Nostalgia's not what it used to be.
  28. Er.... "give it to a friend"??? by mark-t · · Score: 2, Insightful

    Okay... get some perspective here. The materials alone cost £400... which, giving that number a bit more meaning, works out to something over $750 USD. That's not exactly pocket change for a good percentage of people... and they somehow figure that people will just be willing to casually give them away? Sure, it's not out of reach of the average person's budget for the person who wants one, but it still strikes me as being well beyond the typical person's threshold of disposability.

  29. All it makes is its own brackets by Animats · · Score: 2, Interesting

    It doesn't make a "copy of itself". It doesn't make the plastic output device. It doesn't make the servomotors, the cables, the metal rods, or the control computer. All it actually makes, in fact, are the brackets used to assemble the other parts. The easy parts.

    A manual Bridgeport milling machine, on the other hand, used to be considered "self-replicating". If you have a milling machine, a small foundry, a supply of good quality steel scrap, sand, and fuel, and a skilled machinist, you can eventually make another milling machine and all the foundry equipment. Factories that made Bridgeport milling machines (the design was widely copied) did in fact make them using Bridgeport milling machines. A good 1930s machine shop really can replicate itself with only a supply of good people and raw materials.

    This machine is more hype than substance. It's just a mediocre stereolithography machine. If you want to use a good one, and you're in Silicon Valley, sign up with TechShop in Menlo Park. They have one, and it's not used much.

    1. Re:All it makes is its own brackets by smellsofbikes · · Score: 3, Interesting

      You bring up an interesting point. Lathes and mills, like compilers, can be self-replicating. In a belt-driven machine shop, working with somewhat crude tolerances, you can make a whole new belt-driven machine shop to the same (or maybe even slightly better) tolerances. But a '30's machine shop couldn't make modern vacuum-degassed, oil-impregnated bronze bearing stock, for instance: they could only make machines that had basically the same materials they themselves were made of.
      Our ability to work with bulk materials has always lagged somewhat behind our ability to make specific, custom materials, in other words -- consider what I think is the highest point of materials science, directional solidification casting of turbine blades, where we have figured out how to control not only what goes in, but how the molecules structurally relate to one another in three dimensions. To build a universal 3D printer, we have to learn how to print more than just atom-by-atom: we actually have to figure out how to distort atom-by-atom printing to establish strain within materials -- and that's just to replicate things we're already building.
      Anyone interested in further reading on 3d printers could stand to start by reading Saul Griffith's master thesis (pdf) on the subject. I'm building a larger version of the LEGO chocolate printer he discusses/documents in there, and I've gotten a couple of jobs by explaining to crabby old machinists how I managed to cut a new, true lathe spindle on my old lathe with a bent headstock spindle. The idea of self-healing and self-replicating machines has always fascinated me.

      --
      Nostalgia's not what it used to be.
  30. Let's be honest now by Bruce+Perens · · Score: 2, Insightful
    Let's be honest about the self-replicating capacity of RepRap. If this device were even close to being able to produce the electronics embodied in itself, it would have to be much more complex than just a manufacturer of 3-D plastic parts. Without those electronics, the device is really just a skeleton.

    I submit that without the capacity to manufacture a working integrated circuit, the claim that the device can replicate itself should be considered a deliberate act of fraud.

    Bruce

  31. Re:An Old Programming Problem by Teancum · · Score: 2, Interesting

    I remember the contest... and somebody turned in a zero byte length source file. Really! Nothing at all as the source.

    A standard C compiler (like GCC) will produce precisely an exact copy of the source code when the object code is executed at run-time.

    The one thing that kept the contest from getting flooded with additional variations of this software was the requirement to be original and that nobody could use a previously published algorithm. This does make you think, however.