Hall Effect Filament Sensor

thingiverse

Human: Customized an existing model of an E3D Titan extruder to develop a Hall effect Filament Sensor. Two spherical magnets embedded in the filament guide wheel are detected by the 49E hall effect sensor. I utilized an Arduino and a compact OLED display to count pulses. Hall effect sensors can be sourced here: https://www.aliexpress.com/item/10pcs-49E-Hall-element-OH49E-SS49E-Hall-sensor-Hall-Effect-Sensor-new-Free-shipping/32655757933.html?spm=a2g0s.9042311.0.0.27424c4d4oPiO6 The magnets used are 2mm sphere magnets. https://www.aliexpress.com/item/High-Quality-GCR15-Solid-ball-High-precision-G10-1-2-3-4-5-mm-100Pcs-hardness/33000818866.html?spm=2114.search0104.3.2.530054e8vYoAZq&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_10130_10547_319_10059_10884_317_10548_10887_10696_321_322_10084_453_10083_454_10103_10618_10307_537_536,searchweb201603_54,ppcSwitch_0&algo_expid=b389b559-606a-4578-a100-87cadcc104f0-0&algo_pvid=b389b559-606a-4578-a100-87cadcc104f0&transAbTest=ae803_3 Only two magnets were used in the design, with the south pole pointing out from the guide wheel. The STL has provisions for up to four magnets. I found it more challenging to count pulses with four magnets rather than two. My initial intention was a visual indicator that the filament had jammed or broken, but this concept could be expanded. Other components you may need: M3x40mm screws x 3 M3 Nuts x 3 M4x30mm x 1 2mm shaft 27mm Long (salvaged from old printer) PC4-M6 Fitting Nylon Tube 40mm Spring 26awg wire Super Glue Tips: Heat shrink was used around "Titan_Filament_Sensor_-_Guide_Wheel_2b.stl" to improve grip on the filament. The tension of the spring should be significantly less than that of an extruder. "Printer Mount.stl" is for a Prusa clone with a wood frame, but any mount for an E3D Titan extruder should work. Super Glue was used to secure the sensor.