This is a tool to assist in marking offsets for 3-axis turnings. After printing the tool, put a small screw in the center hole to use on the center of each end of the turning. Then use the calibrated holes (1/4 inch increments) to mark a circle for the amount of offset. Use the three 120 degree slots to mark your offset points on the circle you have drawn and you are ready to start your 3-point multi-axis turning