Any Arc
thingiverse
In less than 30 minutes ..... you get a compass and a protractor - maybe- ..largest radius is 60 mm .. the angle between the holes is 6 degrees .... and it is divided - outside notches- into 5 degrees. I used a 2mm nail for the center . and a mechanical pencil 0.5 for drawing arcs P.S.: Use 5 walls is stronger and faster in printing .... No support
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