CR10 vertical low filament guide

thingiverse

My CR10 came with a filament sensor that pauses printing when the filament runs out. I wanted to mount the spool holder on top of the frame, which was easy, but then the filament ran vertically straight down to the filament sensor. This had a horizontal channel for the filament, resulting in it pulling the sensor off the extruder bracket. I got hold of the STL file for the filament sensor housing and reworked it. After several attempts, I finally got it right; I wanted to guide the filament out of the sensor housing through 90 degrees into the extruder. I tried a curved surface but was worried about too much friction. To reduce friction, I designed a small pull wheel and added a spindle on the bracket. I had to move the whole assembly slightly to avoid the Z screw and raised the sensor housing enough to avoid the wheel. If you have the sensor, you can unscrew the lid of the existing housing, remove the two screws holding the small PCB in place, then screw the PCB into the vertical case. The old lid may fit, but if it's a bit tight against the bracket, I modified the STL file to reduce the size of the lid along that edge. I designed this using Tinkercad, and you can edit it online at https://www.tinkercad.com/things/lktY3KaPRoV