NEMA (extruder) motor rotation indicator (Prusa MK2(S)/MK2.5/MK3/MMU2)

cults3d

I always like to keep tabs on what my printers are up to. Sometimes I find myself wondering what the extruder motor is doing - whether it's extruding, retracting, moving at a snail's pace or zooming along at top speed - which can be hard to see on the Prusa i3 MK2 / MK2S / MK2.5 / MK3. So I designed an indicator that you can snap onto the axis of the NEMA extruder stepper motor with ease. Simply print out the design, glue a magnet to it using some super glue and let it dry before snapping it onto the motor. Make sure the magnet is glued to the raised side, then you're good to go! These prints take just a few minutes to complete. For fun, I even came up with a "Dutch Windmill" version. For those who like to stick to the original plan: unfortunately, the extruder motor rotates clockwise when it's in motion while Dutch windmills turn counterclockwise. I also added a smiley version just for kicks. Feel free to come up with your own design and don't forget to share your creation! I've uploaded six versions of this indicator: * Indicator version for an 8x3mm Magnet * Windmill version for an 8x3mm Magnet * Smiley version for an 8x3mm Magnet * Lightning version for an 8x3mm Magnet * Indicator version for a 6x3mm Magnet** * "Turbine" version for an 8x3mm Magnet (https://www.thingiverse.com/thing:2802136) **Note that the 6 mm magnet version didn't quite work out for me, but I've left it available just in case someone else might have better luck with it. If you do decide to use this version, keep in mind that it rotates but tends to slip. Mikolas Zuza from Prusa Research has also written an article about this indicator / visualizer on the Prusa website: https://www.prusaprinters.org/visualize-extruder-motor-movements