Circle Center Finder
thingiverse
Works with the rule from your standard combination square.Use 6 x 3mm magnets for a good hold. https://www.amazon.com/gp/product/B07873ZCY4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Download Model from thingiverse
With this file you will be able to print Circle 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 Circle Center Finder.