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IR Filament Sensor Housing for Prusa / Bear / Zaribo and Bondtech extruder

by wschadow Apr 22, 2019
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I am having the same issue with this one as the one from Bondtech. The magnet attaches to the sensor and won't return when the filament is removed. Now what? :( Guess I wasn't meant to use a filament sensor.

what type of screws are you using? Please try stainless screws and no steel screws as they affect the magnets. Don't tighten the lever too much it should be able to move as free as possible

I was using the screw that came with the Prusa upgrade kit. But I guess it doesn't matter now. The sensor isn't working anymore. I have about had it with Prusa and their half-ass solutions to problems they never check for functionality or reliability. I had given up on the MMU2 because their sensor solution for that was unreliable. Figured I would just use this one and even more problems. :( Thanks for giving me something to try though. It's sad when the community has to find the solutions to Prusa problems.

What's the length of screw used for the forward mounting hole (the one that goes through the lid, sensor body, AND into the Bondtech extruder)? Because it's definitely not an M3x8 as called for in the Bondtech instructions.

M3x20 will do

Could you update the instructions with this? Also where the square nut goes.

what's the proper length for PTFE between the bondtech extruder and the IR sensor cover? even when shorter than what bondtech listed mine gets squished.

  • Posted with 3D Geeks Thingiverse Browser App

I‘ll measure exact length tomorrow. Should be 6-7 mm.

I'm assuming there was something off on my printed parts. I went ahead and printed your version and will try and make time to install and test it out tonight. thanks Wolfgang!

  • Posted with 3D Geeks Thingiverse Browser App

Printed this up after the solution offered by Bondtech failed miserably. Bondtech's sensor didn't work because the magnet in the arm was too far away from the small magnet and the arm would get stuck on the sensor.

This worked perfectly. The only thing I had to modify was opening up the filament hole on the top cover as it was a smidge too tight. Opening it up with a 2mm drill bit worked perfectly.