It's a model of the stepper motors that are on the Prusa i3 MK3S+, specifically the Z-axis motor, with a Prusa research logo on the back and a mount for the dial on the other side, model is approximately the same size but is off by a few mm.
I have printed it with variable layer height and cranked the layer height to the max in the middle part to try and match the feeling of the part on the real stepper motors.
Using support is optional, if you the corners to be prettier then go ahead but it prints fine without from my experience.
The author hasn't provided the model origin yet.