Laser engraving steel rule graduations.
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Previously:
https://www.homemadetools.net/forum/...767#post194037
https://www.homemadetools.net/forum/...794#post190542
https://www.homemadetools.net/forum/...080#post187709
https://www.homemadetools.net/forum/...219#post191954
https://www.homemadetools.net/forum/...104#post191535