Pinouts.ru ~ Great comprehensive guide to pinouts of devices / connectors
Nice connector sample kit, good for matching up existing stuff
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Filament Width Sensor 4 https://github.com/superzerg/TCD1304AP_teensy2pp
- TCD1304AP linear CCD array by a teensy 2++. This is more for 3mm Filament, uses a bigger sensor.
- Link to Teensy board dev home: https://www.pjrc.com/teensy/
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Some general musings https://softsolder.com/2013/06/27/optical-filament-diameter-sensor-doodles/ and https://hackaday.com/2016/02/05/filament-thickness-sensors-what-are-they-and-what-are-they-good-for/
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Early Tom Sanladerer work on a sensor https://www.youmagine.com/designs/filament-diameter-sensor