Hall Effect Filament Sensor

thingiverse

Remixed a model of a E3D Titan extruder to build a Hall effect Filament Sensor. Two spherical magnets pressed into the filament guide wheel are detected by the 49E hall effect sensor. I used an arduino and a small OLED display to count pulses. Hall effect sensor can be found 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 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 I only used 2 magnets in my design and oriented the south pole pointing out from the guide wheel. The STL has places for up to 4 magnets. I found it harder to count pulses with 4 magnets rather than 2. My original intention was just a visual indicator that the filament had jammed or broke but this concept could be expanded. Other parts 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: I used heat shrink around "Titan_Filament_Sensor_-_Guide_Wheel_2b.stl" to improve grip on the filament. The tension of the spring needs to be far less than that of an extruder. "Printer Mount.stl" is for a prusa clone with a wood frame but any mount for a E3D Titan extruder should work. I used superglue to secure the sensor.