Experience? Nope. But I've been researching 3D printers over the =20 past several months, and there is lots of good info on the net, though =20 strewn all over -- not all in one place. I've learned that some of =20 the key properties differences among these materials are the melting =20 points, the type of transition from solid to liquid (gradual or =20 sharp), and if they shrink when cooling. Then there's also the =20 eco-friendly aspect. I don't remember the link right now, but search =20 for a comparison between these. IIRC it was a comparison of 5 =20 materials with properties and recommendations for beginners, etc Cheers, -Neil. Quoting doug metzler : > Interesting that botmill sells PVA; Makerbot sells ABS and makergear, in > addition to ABS, sells HDPE. > > Anyone have experience extruding with all 3 of these? > > this might be [OT] > > DougM > > On Fri, Mar 18, 2011 at 7:45 PM, IVP wrote: > >> > http://www.makergear.com/ >> >> >> http://botmill.com/ >> >> I saw one working the other day on a program called Bad Universe >> >> The inventor was showing how the Botmill could copy its own gears >> >> http://dsc.discovery.com/videos/bad-universe-main/ >> >> It was an episode about an invasion by self-replicating robots from >> Outer Space >> >> Keep watching the skies !! >> >> Joe >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .