You might like this, then, a 'Lyman Extruder': Instructions and Pictures: http://www.thingiverse.com/thing:30642 http://www.thingiverse.com/thing:30642 Video:

You might like this, then, a 'Lyman Extruder': Instructions and Pictures: http://www.thingiverse.com/thing:30642 http://www.thingiverse.com/thing:30642 Video: http://www.youtube.com/watch?v=JebhbxgjBgA http://www.youtube.com/watch?v=JebhbxgjBgA Pellets, 3$ a pound on eBay: http://www.ebay.com/sch/i.html?_trksid=p3984.m570.l1313&_nkw=abs+pellets&_sacat=0 http://www.ebay.com/sch/i.html?_trksid=p3984.m570.l1313&... and to be sold commercially by LulzBot. Plastic, not resin based, but people are still looking into doing cool stuff to solve the challenge you mention.