Simple Center Finder
I made this to find the centre of a circle, particularly for me to align gears & wheels. The groove makes it easy to draw a line with a sharpie/marker. Simply align the inner edge of the tool to the outer edge of your circle/gear and draw a line. Repeat this once or more times and where the line crosses, that would be the center.
I made two version. one at 90 degree and one at 110 degree angle.
If you print it at thicker layers, no support is needed.
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