Prusa i3 w/Bondtech BMG Extruder Visualizer

This is a remix of s_kohls Rotation visualizer, same overall dimensions except I changed the appearance to look like flames/waves/sawblade ish going around the outter edge and different cutouts in the center. Super Glue in a round 8mm x 3mm thick Neodymium Magnet and then simply attach it to your extruder bearing.