This closes the bottom cutout in the front beams of the enclosure which isn't needed when using the MMU auto rewinder.
https://www.printables.com/model/702217-mmu3-mmu2s-5-spools-auto-rewinder-adapter-for-unor
The original kept warping, as it only floated above supports. Fixes that as well.
Kept the overall fit of the original part so the panels still fit.
Can be printed in the original orientation or rotated on the front face, depending on the printers ability to print steep overhang
The author remixed this model.
The original has a cutout in the front beams F1 and F2 for the ptfe tube. The cutout isn't needed when using the MMU3 auto rewinder mod, which has an exit at the back.
This closes the cutout.