Aperture Science Rotation Indicator
thingiverse
I created a custom rotation indicator because I couldn't find one that met my needs. To make your own, attach a small 8x3mm magnet to the stub on the backside using superglue and it will spin as your extruder moves filament. Check out this video for more details: https://www.youtube.com/watch?v=KQ0t3PzYDgU. I also uploaded a "normal version" of the rotation indicator, where the logo is facing in the correct direction - I originally flipped it so it would rotate with the lines.
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