Square, 45 Degrees, and Round Center Finder
thingiverse
Found useful for around the bench in marking lines for cuts, or what ever. Square easily allows for 90 degree perpendicular line and a 45 degree as well. Invert Square and put round object in 90 degree corner (2nd and 3rd picture) and scribe line on the 45 degree leg; rotate for another few lines.and where they cross is the center. Actually it came out rather accurate. If I remember right within a fraction of a degree or so based on my not so great eye sight. Printer is Sovol SV01, any generic PLA seems fine. Check size to insure it is ok for your printer's bed. I used the Brim feature and Support is needed for the model. I also kept all speeds down due to the distance of the legs.
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