It is interesting if you can move various things easily with electromagnetism without using a motor or servomotor. In this prototype, a coil is formed on the PCB to generate electromagnetic.
In order to obtain a sufficient number of turns, the PCB substrate has four layers.
A rare earth magnet is attached to the object to be moved by the coil. A motor driver is used for the coil drive circuit. The current flowing through the coil functions as a H-Bridge motor driver in order to change the direction alternately.
All 3D print data is on Thingiverse.
Crowd campaign is on indiegogo. (All design information is on this page, you do not need buy the product from there.)
These are electric parts I used this time.