this is a simple 50cm ruler you can laser cut. On one side the ruler has a scale from 0 to 50cm in 1mm steps, on the other side you have a center finder (the middle of the ruler is 0 and the edges are 25cm each.
I have also included two holes, one on each end.
You need to engrave the scale and cut out the holes and the outer rim.
Have fun with it
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