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What type of materials can a RepRap print?
The only regular materials currently in wide use are ABS ans PLA. Plenty of other materials were tested, though, with varying success.
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Can a RepRap print materials with high melting points?
Yes, if you create an extruder extruding some 2-part material like Polyester or Epoxy.
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Also, how easy is it to adapt a RepRap to print circuit boards?
That's a field getting a lot of attention recently:
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reprap.org]
[
reprap.org]
Direct printing of some conductive was tried, but didn't get beyond basic experimenting, yet.
