Optical runout sensor
thingiverse
Optical filament runout sensor: Marlin setting: #define FILAMENT_RUNOUT_SENSOR #if ENABLED(FILAMENT_RUNOUT_SENSOR) #define NUM_RUNOUT_SENSORS 1 // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each. #define FIL_RUNOUT_INVERTING true //false // Set to true to invert the logic of the sensor. //#define FIL_RUNOUT_PULLUP // Use internal pullup for filament runout pins. //#define FIL_RUNOUT_PULLDOWN // Use internal pulldown for filament runout pins. Necessary parts: 4x15 mm soft spring Optical end stop: https://www.aliexpress.com/item/32972342907.html?spm=a2g0o.productlist.0.0.70dc15eebTHpAe&algo_pvid=f68dd1be-7d39-49bb-9e41-7288e3432f8c&algo_expid=f68dd1be-7d39-49bb-9e41-7288e3432f8c-0&btsid=0be3743b15880101146465242e17cd&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
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