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.
Also had the problem with constant breakage. I modified the SCAD file provided and created a remix here:http://www.thingiverse.com/thing:2308097 . I bulked up the area around the center bearing to ~3mm and tightened the bearing tolerances to better hold the bearings for me. Not as attractive as the original model, but hopefully can survive drops better.