Designed by Melvin Cruz, Jon Schull and Skip Meetze at Rochester e-NABLE Lab, the device causes a 3D printer to Pause when filament goes missing or becomes tangled on the spool. After correcting the problem, a user can Resume the printing to complete the job. The Micro Switch connects to Octoprint on a Raspberry Pi.
Updated to 7292 (a date code by-the-way) on 19 October 2017 by moving and reversing the arrow symbol on the sensor box. It works best for detecting tangled filament (or filament with a kink at the end of the spool) if it feeds from the hinge end toward the rubber band end.