 They sell this extruder kit for $34.00 http://store.qu-bd.com/product.php?id_product=11 http://www.buildlog.net/wiki/doku.php?id=ord_bot:qu-bd_extruder_improvements http://www.buildlog.net/forum/viewtopic.php?f=27&t=1700 http://quintessentialuniversalbuildingdevice.com/                         And there is also the dual head:  http://store.qu-bd.com/product.php?id_product=11 And this is a nice improvement: |