I really loved Cocian's beautifully simple extruder visualizer but I wanted something for the Z axis extruder on the Prusa Mini. Requires one 6x3mm magnet. I would recommend 4 perimeters and 100% infill, it's a very quick print!

Please also check out my similar Prusa Mini Rear Extruder Visualizer at: https://www.prusaprinters.org/prints/122529-prusa-mini-rear-extruder-visualizer