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Most of those materials are reverse engineer-able, though. This has a significant impact on the big manufacturer's bottom lines... they derive most of their profit from materials, just like regular printers.

I'll just leave this here: http://open3dp.me.washington.edu/

Specifically: http://open3dp.me.washington.edu/2009/10/plaster-based-powde...

See how cheap that is? Crazy...

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You can probably get a spec-sheet for their proprietary materials if you ask. You might have to reverse-engineer cartridges with security features though.

The Fab@Home guys are trying out various different materials, since their syringe-based extruder allows more flexibility than the RepRap.

http://fabathome.org/wiki/index.php/Fab%40Home:Materials

As far as cheap materials go, it doesn't get much cheaper than garbage plastic.

http://reprap.org/wiki/Recycler

> You can probably get a spec-sheet for their proprietary materials if you ask.

Or you could just go here (this is my old startup): http://marketplace.cloudfab.com/fab_facts (click through for every datasheet on every machine and material)

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