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Yeah its just pla plastic. The curved rod i bent by hand.
Cut a form out of MDF of the desired radius minus half the diameter of the threaded rod.
Then just did small bends along the length untilit matched the curve. It was a 1mtr length to start. I checked the curve against a template and cut the best section out.
I would like to 3d print a rack and pinion gear setup but not sure it would be as accurate..
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