NEMA (extruder) motor rotation indicator (Prusa MK2(S)/MK2.5/MK3)

myminifactory

I always like to see what is going on with my printers. Sometimes I wonder what movement the extruder motor is making, which isn't always visible on the Prusa i3 MK2 / MK2S / MK2.5 / MK3. Hence, I designed an indicator that you can magnetically snap onto the axis of the NEMA extruder stepper motor. Just print the design and glue a magnet with some super glue onto it, then snap it on the motor, making sure to glue the magnet to the raised side. These prints take only a few minutes. For fun, I designed a "Dutch Windmill" version, but I had to admit that the extruder motor rotates clockwise when extruding while original Dutch windmills turn counter-clockwise. I also added a smiley face version. Feel free to make your own design and don't forget to post a made one! I've uploaded five versions: an indicator for an 8x3mm magnet, a windmill for an 8x3mm magnet, a smiley face for an 8x3mm magnet, a lightning bolt version for an 8x3mm magnet, and a "turbine" version for an 8x3mm magnet. Mikolas Zuza from Prusa Research has also written about this indicator on Prusa's website: https://www.prusaprinters.org/visualize-extruder-motor-movements/. On Thingiverse, Insanity682 pointed out that he posted a magnetic attachable extruder indicator before me - of which I was not aware (https://www.thingiverse.com/thing:2285254), so credits to him. Following this notification, I could find that Tinkerer did something similar in 2013 already (https://www.thingiverse.com/thing:119000), so kudos to them as well. Neodymium magnets are easy to find.