YA Filament Jam Sensor

I made this filament jam detector to ensure reliability and ease of use with my printer. I've used it through countless spools of filament now, and can say it has definitely achieved it's goal. It has a some utilitarian features worthy of note:

- TPU tire to grip filament
- Printed tensions springs integrated on pressure arm
- Easy and precise spring tension adjust (uses screws)
- Transparent LED light pipe for visual sensor state feedback
- Fully supported all ball bearing movement (uber smooth)
- ~0.6mm filament movement resolution
- For 1.75mm diameter filaments
- No-support printing
- Several mounting options

In case you are not familiar with what a jam sensor is... Marlin can be configured to use what is basically an optical endstop to determine if filament is flowing as expected per the motion planner. Repeated on/off toggling of the input pin tells Marlin the filament flow is working as expected. If so many mm's of filament has been extruded without seeing a state