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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?

Thanks.