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 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. ***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 I made dual version of this as well: http://www.thingiverse.com/thing:300525 Up next....fan adapters for 40mm and 60mm fanscustom coupling instructions printing instructions