Filament Sensor (with filament guide) for Octoprint (Monoprice Select Mini)
thingiverse
UPDATE 9/2 2018: I've made an update to fix the top of the filament sensor, adding a small box that presses down on the switch. This remix combines BrianHanifin's excellent design with a built-in filament guide. I created this because my endstop cable was too close to the printer box. If you decide to print this, be prepared to use a sharp knife and some sandpaper to free up the ball inside the filament guide. I'm aware that this might not be the most elegant solution, but it works for me, and I hope it will work for others.
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