Centre Finder
thingiverse
These are three different versions of centre finders to identify the middle of a circular object. One is for use in a drill press to find the centre of a rod, the others are more general set-square type versions. The openSCAD file is parametric, so you can adjust dimensions to suit your need (including offset for blade/scribe/pen diameter).
Download Model from thingiverse
With this file you will be able to print Centre 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 Centre Finder.