Filament runout sensor
thingiverse
Bracket for Dual Filament Runout Sensor: http://mauk.cc/webshop/cartesio-shop/electronics/Dual-Filament-Runout-Sensor To Assemble the Dual Filament Runout Sensor: http://mauk.cc/mediawiki/index.php/Assembling_the_Dual_Filament_Runout_Sensor
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