Filament Runout Switch Mount

thingiverse

I have created so many great things with Holspeed's filament roller, thanks for making that possible! This is just another awesome project where you can add a microswitch to your Ender 3. I wanted to give it a straightforward path with plenty of clearance to easily feed filament even with my big hands. Big thanks also go out to eussrh for the fantastic switch holder design! I modified the discharge end to fit the reed perfectly, and I even added a slight bend in the reed at the exit end of the enclosure. For this project, I used Philmore part number 30-18222 and three 2mm x 16mm screws and nuts for the switch, along with a 608 bearing and a 3mm x 20mm screw and nut for the roller. You will need two spacers to secure the inner bearing race in place. I opted for the ZMax, which is the D19 pin highlighted in the pinout diagram for the MKS Gen L. Marlin defaults to Servo_3, but even with a pull-up resistor, I was experiencing intermittent issues - maybe it's just my board. I rigorously tested this setup using both Pronterface and live testing multiple times. This is just one of many different styles out there, but I came up with something that fits my needs perfectly. Maybe someone else will benefit from this project as well!