This is a center finder that allows you to find the center of a piece of round bar or pipe.

It is placed in the chuck of a drill press or end mill and then lowered onto the workpiece so that X and Y adjustments may be made that find the exact center of the workpiece.

Here is an example of this type of tool in use and should be all the instructions necessary:

https://youtube.com/shorts/sTIniAeRKg0?si=uap_3EqQqfAA-WkF

(not my video)

The model requires no supports and is print-in-place.