Never loosen the threaded insert again. It can also be used for MMU2S.
Parts:
1x ruthex® threaded insert M5
1x 21mm PTFE-Tube(2x4)
Countersink both ends of the PTFE-Tube.
https://www.printables.com/de/model/71785-fs-cover-mmu2s-sruthex-upgrade
The author remixed this model.