MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Hm, I see your concerns. There are some remixes using 1/8 pipe thread, e.g. http://www.thingiverse.com/thing:835542 or http://www.thingiverse.com/thing:676687. The design is easy to customize, so please feel free to change it for your type of fitting if you don't have a common 5mm OD push fitting.
Did you use a second hexnut on the idler screw to adjust the pressure? I never had any issues with a stalling motor so far. Maybe your stepper driver current is adjusted too low?