October 9, 2025
Description
This is a lowcost version of Optotap_filament_sensor. It combines a filament switch sensor and a filament motion sensor but also can be used as encoder in Multimaterial Units.
The filament motion sensor precision is around 1.5mm.
As Optotap_filament_sensor, there's is version for bontech collet, UM2 or Ecas04
The BOM price is estimated to less than $4. Actually, I can build around 10 of this with the material sourced.
Bill of materials
| Hardware | qty | Notes |
|---|---|---|
| Optical endstop | 1 | PBC size is 33x10mm, e.g https://bulkman3d.com/product/optical-endstop/ |
| pin D3 20mm | 1 | e.g : 3.0x20mm BMG kit shaft |
| 623zz bearing 3x10x4 mm | 1 | |
| EPDM rubber O-ring #5 (5.7mm x 1.9mm) | 2 | Any OD10mm CS2mm should work, ! EPDM not Silicon |
| M3 x 10 BHCS | 2 | |
| M3 x 16 BHCS | 1 | M3 x 20 if you wan't to screw it to the frame |
| Pushfit collet | 2 | bondtech collet, UM2 or ECAS04 |
| D2F type microswith | 1 | |
| M2 x 10 self tapping screw | 2 | |
| JST-PH 2P header | 1 | |
| Isopropylic Alcohol (IPA) | ! Important : Clean o-rings with IPA to give enough grip |
See Optotap_filament_sensor for print settings, assembly and Klipper config
License:
GNU General Public License v3.0
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