Variometer - variable inductor

This is a basic cylindrical variometer. The inner coil can rotate 180deg in reference to the outer coil. The rotation is limited by design. To keep all the wires tidy, the axel has an inner cutout where the wires can pass trough.
When printing, the outer inductor half needs to be printed twice. The final assembly requires glue.
More details on operation and assembly can be found in the video below.