Video :   https://www.instagram.com/p/CdHFaYDlNWp/

Planetary gear vizualizer, I used 4 8X2mm magnets, test the height of the magnets and the distance from the extruder, the cover must move freely so that the wheels rotate. I bothered for a long time until I found out. It moves interestingly during retraction

It also helped to spin the gear with a drill, it relaxed better