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3-D Printing Comes To Amazon
An anonymous reader writes Promising "an appstore for the physical world," Amazon has just unveiled their new online market for products created using a 3-D printer. "Customization gives customers the power to remix their world," explains the co-founder of Mixee Labs (an Amazon partner), "and we want to change the way people shop online." Amazon's ability to sell you things before they've even been built is currently limited mostly to novelties like iPhone cases, jewelry, and bobbleheads that look like you. But this could be the beginning of mainstream 3D printing.
Depends on what you pay.
A poorly calibrated fused filament unit will produce stringy junk that delaminates if you look at it funny. A well calibrated one will achieve something reasonably close to what the plastic it is using is actually capable of. Outside the cheap seats, you can print all kinds of things(especially if you count parts that require one or more additional processing steps as '3d printed'. Printing wax, for example, is pretty undemanding, and allows you to do lost-wax casts of more or less any shape that will cast properly, without needing a printer that can sinter or melt metals. Some of the techniques for producing ceramics are in the same vein, the printer just needs to tack the ceramic material together long enough for firing, which takes care of the mechanical properties.)
The one thing that is (relatively) easy with injection molding that 3d printing (to my knowledge) isn't so hot for is overmolds. When injection molding you can use insert molding or multi-shot systems to achieve the (enormously common and fairly popular) combination of a rigid plastic structure with an elastomeric surface treatment for grip or aesthetic reasons. For prototyping purposes you can get paint-like coatings that emulate elastomeric overmolds that you can brush on to 3d printed parts; but the quality isn't as good and production takes longer.