This is a remix of @Extrutim's excellent extruder indicator/visualizer that stays centered and uses press-fit magnets.
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The author remixed this model.
Differences of the remix compared to the original
- I added a hole for press-fitting two 6x2mm magnets
- The exterior of the magnet hole doubles as an alignment pin so that the indicator stays centered
These tolerances are rather precise, so I modeled them using cylinder shapes within PrusaSlicer. If the values that worked for me are off with your machine, you can adjust their sizes by changing the x and y dimensions of the cylinders by opening the included .3mf file.