Here's a pic of what it looked like after a few more tweaks.
This print was still a bit rough - that case wasn't designed for belt printers but more traditional ones.
You'll notice in the pic there's a slice underneath the case. This is one of my own designs to add an expansion unit to the MMS case.
https://github.com/peter-mount/mms-expansioncase
Note: RMC now have their own slice options which you might have seen in today's Video.