The magnet is moved along the film by two sets of coils embedded inside a flex PCB mounted just below the ... he used a pair of TB6612FNG stepper motor drivers, controlled by a Wemos D1 Mini.

A few builds we’ve seen, like the PCB drill press or the horribly inefficient ... you’ve got a very inexpensive linear motor. In our days of dumpster diving, we can’t count the number ...