Filament Runout Sensor using 12x6x6mm Micro Switch with Roller

thingiverse

Wanted to make a filament sensor using the smallest switch. Didn't find any with a roller and no extra parts, that also had a supertight gap enabling flexible filament use. So i made my own. I opted for using the smallest microswitch I could find with a roller. Microswitch Specification: Color: Black Rating:1A 125V AC Operating Temperature: -25°C to +65°C Contact Resistance: ≤30MΩ Insulation Resistance: ≥100MW Withstand Voltage: AC 300V/min Life:≤5,000,000 Dimensions: 12mm(0.47") x 6mm(0.23") x 6mm(0.23") Pitch: 6.5mm SPDT contacts PCB solder terminals Designed for a 2pin JST-XH Header. BOM: 1x - Microswitch with roller (12x6x6mm) 1x - 2pin JST-XH Header 3x - m3x18mm screws if you want to use nuts on the backside, 12-16 if you want to rely on threaded plastic 1x - short wire Assembly: - Insert a 2pin JST-XH connector into the 2pin JST-XH header (this alleviates issues with melting and bending). - Bend one pin of the JST-XH so it almost touches the pin on the microswitch (pictured) - Solder a bridge between the JST-XH pin and the microswitch (pictured) - Solder a wire from the NC pin to the remaining pin on the JST-XH connector - use cyanoacrylate glue (CA) to glue the JST-XH header in place. - Make a wire with a 2pin JST-XH connector on the end, and whatever you need to connect it to your controller board at the other end. (Polarity doesn't matter). - Use the chamfer tool and a knife to chamfer the outside edge of the input PTFE tube - Use a countersink bit to chamfer the inside edge of the output PTFE tube Klipper Macro: ### Custom Filament Runout Switch Sensor ## https://docs.vorondesign.com/community/electronics/120decibell/filament_runout_sensor.html ## Change switch_pin to your pin ## Make sure you have M600 already. ## This is set up to resume manually after changing filament [filament_switch_sensor filament_sensor_bowden] pause_on_runout: True runout_gcode: M117 Out of Filament M600 insert_gcode: M117 Filament Detected, ready to resume #RESUME_MACRO event_delay: 3.0 pause_delay: 0.5 switch_pin: PG11 # CHANGE THIS TO YOUR PIN Fusion360 Design File included for easy remixing. Print settings: Orientation: Print with arrows facing down. Filament: PLA (or ABS if used inside a chamber) Nozzle Size: 0.4mm Layer height: 0.2mm or less Parts are simple, No support, No Brim, raft or anything needed