Thanks for this. I just thought I’d note that we’ve found the same issue recently with our printer. I always used some tape to sort it out, but @j.stirling is now working on a much neater solution that tightens the gear with a couple of small self-tapping screws. It’s on GitLab if you fancy trying it out - you can download the zip file of STLs from the “pipeline” bit just below the main description - look for the “build” artifact.