So I asked myself why I couldn't find a bowden adapter for the Jr. V2... for some reason the printrbot community on thingiverse is obsessed with mostly the plus and simple... anyway I did my research and a drew one up... Then I made it dual :P Disclaimer, I haven't tried it yet, still getting the tube and other hardware. if you have a problem tell me intended to work in conjunction with this cable coupling: http://www.thingiverse.com/thing:1899 READ INSTRUCTIONS to figure out how to resize it. IMPORTANT - POSITION SPECS: ***I know nothing about hole sizes... I just assumed M3 bolts and I made tight holes 2.3mm and loose holes 2.5mm if anyone has any knowledge about that or suggestions let me know, thanks Up next.... fan adapters for 40mm and 60mm fanscustom coupling instructions printing instructions other notes you'll need this and another motor to get this to work on your printrbot: http://printrbot.com/shop/printrbot-extrudrboard/