Center Finder
thingiverse
Here's My Design of a Simple Circle Center Finder. It Allows Measuring Diameter Up to 190 Millimeters.
Download Model from thingiverse
With this file you will be able to print Center Finder with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Center Finder.