It’s a small linear motor which [ligonapProduktion ... the break shows him testing the motor. In this screenshot he’s holding the center shaft while the coil assembly moves back and forth.

To drive the coils, he used a pair of TB6612FNG stepper motor drivers, controlled by a Wemos D1 Mini. The housing was 3D printed mostly from PLA, but with a few bits done in PETG. This was for ...