CR10 Filament Runout Sensor (from a spare limit switch)

thingiverse

This is slight modification to psdesign's [Filament Sensor Mount for CR-10](https://www.thingiverse.com/thing:2811590), so all credit for the fantastic geometry of it goes to him. I've modified his model slightly to: - Align better with the stock CR10 extruder. The original was designed for an after market extruder that sits slightly higher which put strain on the filament path with stock parts. This just involved lowering the whole model a little bit. - Use standard M3 screws for the whole model (which is probably what you have on hand) instead of countersunk M3's. Fusion 360 files are included if you want to modify further. I had a spare z limit switch left over from my printer when I installed a BL touch, and that happens to fit perfectly inside this model. You'll need the following to install this: - 1 Stock Creality limit switch. - 3 M3 8mm screws - 2 M3 12mm screws Here are some tips for printing: - Print in the obvious orientation, with both flat sides down. - Recommend printing with a lot of infill, I used 50% and its plenty sturdy. Since the parts sits offset from the Z axis screw and could flex over time from strain on the filament its important for the base plate to be sturdy. - Thinner layers would probably be better, but mine is working just fine printed at 0.2mm. - I used PETG because my printer is in a heated enclosure. PLA or literally anything is probably fine otherwise. Here are some tips for installation: - Wrap some packing tape over the limit switch lever before you install it. This isn't critical, but if you don't then the filament can catch on the little groove cut into the lever and make inserting filament very frustrating. psdesign has some good pictures on his [original design](https://www.thingiverse.com/thing:2811590) if you need more guidance. - Make sure the channel the filament travels down is smooth, sand if necessary and remove any whiskers that might obstruct the switch. - Don't tighten the screws too tightly when mounting the sensor to the frame as this may "constrain the bearing from moving into the most comfortable position" (also from psdesign).