Winding key - Prusa extruder indicator
thingiverse
Yet another design of extruder indicator for Prusa printers. Part uses a 6x3mm neodymium magnet that should be glued inside the hole, which centers the magnet to the motor shaft. This setup seems to work reliably for now (I had this printer for a week when designed it). I've included two versions of the print with the handle holes twisted by 30 degrees - I couldn't decide which looks better. During printing the motor gets quite warm, so I don't recommend to print with PLA because the tip of the part slides into the motor where it could deform and melt.
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