Out of Filament sensor that detects spool jam.
https://www.thingiverse.com/thing:429...

BOM:
623ZZ Bearings Qty 3
M3 X 35mm Screw Qty 1
Pen Spring Qty 2 ( one needs to be stiffer)
M3 Washer Qty 2
M3 Nut Qty 3
Optical End Stop sensor Qty 1
M6 PTFE fitting Qyt 2
M3 X 12mm Screw Qty 2

You want to know more about the HevORT advanced DIY 3D printer?
WEBSITE....: http://www.hevort.com

You want to learn and contribute to the project?
FORUMS: https://forums.hevort.com/index.php

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MirageC