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CPAP is important for people with sleep apnea ... Not every sleep apnea product is going to be equally effective or equally advertised, that's true.

Saw announcements about 3-D printed CPAP masks a few years ago. I'm guessing they are mainstream by now:
http://inspiratemedical.com/
https://www.3ders.org/articles...

... Do some of that before you form your next opinion, I fucking dog dare you ...

Whoa. Easy there boss. We're all only human. It ain't the end of the world.

The pictures and short construction movie:
https://www.3ders.org/articles...

When you consider what types of parts that can be made from printing in metal, they parts quite likely come out stronger than milling because it isn't possible for any shape to be milled. Also consider that not every part needs to be structural, and those that are, if the raw material isn't as strong you can re-design the part to be bigger. Since titanium is lighter than steel, you can have a bigger part and still come out with lower weight. NASA uses it as does GE.

http://www.3ders.org/articles/...

Not sure what you mean by 3d print to completion, unless you mean no other steps than printing and then using.

As far as the ABS guns, my understanding was that the only metal parts were the ammo and firing pin.

https://3dprint.com/139537/3d-...

Okay, but you weren't specific as to what you meant by "strength."

So how about 3D printing with carbon fiber ?

The whole point of this exercise is that the properties of a material change with how you structure it, and 3D printing gives you access to lots of structure options.

More materials are becoming possible every day, so to make a flat statement that "There is ABSOLUTELY NO WAY for additive 3D printing to be stronger than forged steel" is foolish, as you will be proved wrong sooner or later, no matter what isolated property of steel you choose to compare against.

While I doubt it is unique to 3d printing (I could be wrong though) but the simple pour into mould methods won't work without taking into account the relative densities of the metals involved (depending on how long they take to cool they may separate out anyway).

The real benefit I can see here would be from the ability to control how fast you move from one material to another which seems to be one of the major benefits (having the gentle transition of the alloy removes the transition point and the matching weak point).

What may be unique is the control that 3d printing offers, I'm sure someone can create http://www.3ders.org/images/bu... without using 3d printing but I'm also sure its not a quick / easy process.

The article is in The Guardian, so it makes sense for the price of the paintings to be mentioned in pounds, but they could have changed it to euros for the summary. After all, that is the currency in the Netherlands. A bit of googling yielded more details and a price of € 25,000 (about US$ 33,500) for each replica.

The UV polymerization machines seem to work quite well. The high-end machines produce consistent results and don't need to be watched while running. They're still slow, though. The Form1 printer may get there, if they ever really ship the thing in quantity

http://www.3ders.org/articles/20120911-a-list-of-diy-high-resolution-dlp-3d-printers.html For comparison

Already done. http://www.3ders.org/articles/20120920-laywoo-d3-new-fdm-filament-can-print-wood-with-tree-rings.html

These exist. There's even a contest to build a reliable, sub-$250 home filament extruder. Filabot used to have the lead, but http://www.3ders.org/articles/20121023-making-a-plastic-filament-extruder.html is also fairly interesting. But none of them seem to be close enough to finalized to actually use in daily life yet. I've heard someone say that it'd be easier/cheaper to just buy loads of plastic pellets rather than dealing with impure plastics from recycled materials. Pellets seem to be about 1/5th to 1/10th the price of good filament.