A while ago I saw an extruder indicator consisting of a hamsterwheel and a silhouette of an hamster in it (https://www.thingiverse.com/thing:3139180). I re-designed the wheel from scratch, took a pikachu model from Thingiverse (https://www.thingiverse.com/thing:1731676), removed the ears and the tail, and placed a ring on it.
Print the three parts, hang the hamster on the pin (check the direction!) and glue the cap on the pin. Glue one or two 8x3mm round magnets on the back, and stick it on the extruder: your hamster-driven Prusa is good to go!
Default setting, but use supports for the hamster. Since it's not a large or structural part, I didn't care for a perfect print myself... :-)
The author marked this model as their own original creation.