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.

Download Now

Report as inappropriate

The main difference is on each end one of the parts has a slightly larger hole to create a loose fitting hinge (about 0.2mm additional clearance). The "B" parts are just a mirror image of the "A" parts. Reason for making the A/B versions is otherwise I was concerned that the assembly may slide apart - have added an image that hopefully explains.

All that said - more than happy to take your guidance as this is all a bit trial-and-error - its greatly appreciated!