Summary:
Honkler/Clown World refrigerator magnet with no MMU/AMS needed for multiple colors, simply pause on layers to change filament. Magnet measures about 3.5"x3" (88mmx75mm) WxH.
Print settings:
PLA, 0.4 nozzle, 0.2 layers, 2 walls, 10% gyroid infill, classic wall, detect thin walls turned on, optional ironing. I also prefer a smooth build plate for magnets.
Magnets:
Designed for three 6x3 magnets. My magnets actual measurement was 6.0mmx2.7mm so the magnet hole is 6.3x3.2. I paused on the top magnet cavity layer and super glued the magnets in before resuming the print.
Filament changes:
Color order for filament changes: white, purple, orange, yellow, blue, red, green, black
If you stick with 0.2 layer heights:
*Be sure to double check your slicer for layer pauses