Based on the 'bf_v2_drop_tube_light_barrier_id10mm_large_spring' by AmmoMike.
His Thing: https://www.thingiverse.com/thing:2504314
Designed to have a motion sensor board instead of the recommended light sensor.
Works almost as well but it pauses every time a bullet goes by and is only a 'problem' on the initial fill. Still has the 12v LED port in case you can and still want to use it. I couldn't use it.
My openBulletFeeder- DIY bullet feeder build: https://www.thingiverse.com/make:578974
I recommend a brim so it doesn't fall over as easily. It has fallen over during print once before.