Filament Runout Sensor Mech

# Filament Runout Sensor Mech
#### 3D Printer filament runout sensor


### Parts
* 3 - M4 x 30 screws
* 2 - M4 x 6-8 screws
* 2 - M4 x 10-12 screws
* 1 - M5 x 8 screw
* 2 O-rings (I'm using #13) or rubber bands
* 3 x 608 skateboard bearings.
* 1 x Microswitch
* Whichever wire and connectors you need to connect the microswitch to your controller board.

### Optional Parts
* M10 Pneumatic coupler if you use a section of PTFE tube for the filament guide.
* PTFE (bowden) tube.
* Mountting braket.
* T-nuts or hammer nuts depending on your mounting solution.

STL/STEP files for a printable coupler and a guide that can be used instead of the threaded coupler mount are included.

The mounting bracket I've included was made for the the top 2020 extrusion of an Ender 3. It's just an example.

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The switch I used came out of a computer mouse. It should be fairly simple to make a housing to fit other types of switches.

The coupler used is the kind that goes in the hot