BTT smart filament sensor adjustable mount for Ender 3 Pro

thingiverse

*Another mount for* - BTT smart filament sensor - for the **newer one** (molded case, not 3D printed; 3mm shorter and 2 mm narrower) - Ender 3 Pro (Ender 3 / 3 V2 could be ok, but check first the dimensions) - BMG extruder - mine is Fysetc dual gear all metal - I made the mount **adjustable** so it possibly can fits other extruders --- *Installation* 1. get **3 bolts M3x10** (thread is M3x0.5) 2. check the dimensions in step/Fusion files (*my design is based on GrabCAD E3 400 extended model and after print I had to move the distance between Z wheel axis and Z axis screw from 30 to 31 mm. This corrected distance is in files here, it works for me, but maybe your Ender will be slightly different* :) 3. think about part positions on printer bed. I chose those on **fig. 2** and it was ok, but I had a hard time to get mount part from the bed. Maybe raft could be better for it. 4. after print, insert nut from Ender to the mount. Screw the slider to the mount by two M3x10 bolts. **Do not fasten them yet** to leave the mount adjustable yet. Also switch sensor case back for the printed one. See **fig. 3** how it should look like. 5. place the mount on z wheel axis and screw it by the axis bolt. Also screw in the Z axis holder bolt. Don't forget its tiny washer and be patient... ;) After all, fasten both the z axis wheel bolt and z axis holder bolt tight. Assembly should look like on **fig. 4**. 6. prepare PTFE tubing. Insert it fully to the extruder and mark the point where it leaves the extruder. Pull the tube out and insert it fully into the sensor and again, mark where it leaves the sensor. Pull the tube out, add both dimensions and add about 15mm. You have the cut point :) Place the cutted tube again into extruder and try to slide the sensor onto the mount/slider. Do it firmly but not too much - the ptfe tubing shouldn't be deformed - it should be narrow. If the sensor is too far, unslide it and cut a bit of the tubing. And try it again. When You are satisfied, it should look as on **fig. 5**. 7. slide again the sensor on mount/slider and fully to the ptfe tubing. Insert third M3x10 bolt through the slider hole to the sensor back-case. Adjust sensor postition to extruder (both axis - of the extruder and of the sensor - should be same). Now tight all three bolts to secure the desired position. DONE. It should look like on **fig. 6** and **fig. 7**. Try fillament loading - if all is done properly, it should be flawless :) If not, readjust the sensor - extruder position. --- *Note:* I used cheap PTFE tubing here instead of Capricorn. It is because I am not sure if thighter hole is good for filament alignment while its been loaded.