Jarv spinny cap
thingiverse
This thing was created with Tinkercad. Edit it online at https://www.tinkercad.com/things/3ouHVdHAjoJ. It's not flawless, but I'm new to this, so you might need to sand or shave off some plastic on the notch that fits into the 608 bearing. Other than that, the cap fits well and feels great. I also printed a lot in a wide range of infill percentages from 45% to 60 - try different ones to see what works best for you.
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