BOM for non 3D printed parts:
Harbor Freight or Chinese Dial Indicator (really any indicator with a roughly 8mm shaft)
1/2" Round Bar Stock of desired length
YouTube Video and article: https://pcburn.com/drill-press-squaring-with-3d-printed-tool/ https://www.youtube.com/watch?v=J8aucI280jo
This is a simple drill press square using dial gauge indicator for your drill press table
I made it in an attempt to get my old Craftsman drill press something like square with parts I had on hand. Which were, in this case, a 3D Printer, a (digital) dial indicator in the dimensions of the Harbor Freight model, and some 1/2" round steel bar stock.
I couldn't find anything fitting the bill for this on Thingiverse already. If there is post up a link!
Also, I may make an even simpler tool that uses a long 1/4" bolt with a printed part to keep it 40 degrees angled off the half inch round bar stock (which you then rotate to find square) if anyone's interested.
Worked great with the PETG for rigidity. The thickness of the piece helps hold everything steady and prevent deflection.
Sketchup, in this case, although you could use anything you're comfortable with that'll produce the through-holes reliably.