金属丝过量检测器（12x6x6mm微型开关与滚筒组成）

Filament Runout Sensor using 12x6x6mm Micro Switch with Roller

2023-06-27 18:40:47

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Summary

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