I needed a filament sensor for my TradRack/HappyHare setup. This combines two items to make things a little simpler and provide good bowden retention for the Sherpa with a ECAS04 fitting.
Use a 4mm bearing just like Ryans original sensor.
Sensor to extruder distance is about 20mm.
The author remixed this model.
Combines Ryan's filament sensor with the body of the Sherpa Mini, and adds a ECAS04 fitting.