A small circular flat disc with several colors on it that you can assign to different extruders to test with.
This design has several subparts to which you can assign colors however you like:
I changed my extruder to a .6 nozzle spec with a .4 actual extruder to test the fine stars and lines too. The MMU had no problem with a .6 nozzle spec in a actual .4 extruder and it made some nice small stars! There are 18 color changes and it should take only 30 minutes to make.
The author marked this model as their own original creation.