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.
great design! printed all on ABS and works ok!
not using for MMU2, but for some 1KG ABS spools that got tangled all the time!
some pieces I have to change the horizontal expansion (especially pieces that must put a 608 bearing)...
and like rocky00717 says, a chamfer on spool holder thread will be great.
I'm considering to remix this to use a metal thread rod instead of a printable... and to fix on a 2020 profile instead on holder... so, a lots of modifications (remember, i'm using for other purpose, not for MMU2).
I tested with some bolts and nuts (50g) and it was not enough to rewind a full spool of 1kg... some used spools works great (less than 1kg)...
Have you considered using elastic in place?