Optical Filament Sensor v2.1 with Drive Gear - for 1.75mm filament

prusaprinters

Comparision between versionsOn the pictures you can see designed versions of sensor. All are printed in draft mode. From left V1.0, V2.0, V2.1Bom3x 619/5 bearingsspring (I used one from a ballpen)end stop optical sensorMK8 drive gearM5x16 shaft - you could cut M5 boltM3x40 - for idler tensionM3x20 - for mounting idler to bodyM3x10 - for optical sensor mountM3 nutM5x35 (M5x30 should also fit)M5 nut Assembly Sourcehttps://cad.onshape.com/documents/bc431172d582a5a54b3b58ac/w/c4ffc497b40e3855d881f07f/e/8e35b674b9538da00cfbcf5f?renderMode=0&uiState=61d3477ddf0e5e300b92c53c Calibration.General good information how to calibrate this sensor is here https://duet3d.dozuki.com/Wiki/Duet3dFilamentMonitor_RotatingMagnetVersion#Section_Calibration Sensor is supported by:RepRap firmware -  https://duet3d.dozuki.com/Wiki/Duet3dFilamentMonitor_RotatingMagnetVersionsmoothieware - http://smoothieware.org/filament-detectorMarlin - find in configuration.h FILAMENT_MOTION_SENSORKlipper https://www.klipper3d.org/Config_Reference.html?h=filament#filament_motion_sensor - note that klipper required filament change between two high states so calculation is  value = 21mm / (tooth_no) * 3 (mm per status change) - multiple by 3 to increase accuracy and lower mean error Calculation of value.To calculate use formulavalue = 21mm / (tooth_no *2) (mm per status change) Example for klipper:[filament_motion_sensor filament_sensor] detection_length: 1.43181818182 extruder: extruder switch_pin: ^PD10 pause_on_runout: TrueExample for RRF:For my configuration with 44T wheel I used this command:M591 D0 P7 C"e0stop" S1 R50:800 L0.239 E2.64 A1Example output of checks:M98 P"0:/macros/Extruder/Check filament sensor" Pulse-type filament monitor on pin e0stop, enabled, sensitivity 0.528mm/pulse, allowed movement 50% to 800%, check every 6.3mm, measured sensitivity 0.566mm/pulse, measured minimum 89%, maximum 101% over 1259.5mmThose values have some offset due to fast printing with a lot of retraction and enabled PA. 50% is a margin when hot end get clogging. Also could be increased to get it faster.