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.
Admittedly, I'm not using the Akimbo design much myself these days (I've switched to aluminum extrusion and lasercut panels for a box frame), but for anyone who's got an old Mendel around that needs some love, it's still useful.
The Z axis design is actually (sort of) based on the original Mendel axis design, which used six ball bearings on one side, and four on the other side. It wasn't until I built a printer with linear bearings on both sides that I realized that reducing the bearings to four on one side of the Mendel wasn't a cost reduction, but instead made it resistant to binding.