Laser marking red hot round bars.
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Previously:
https://www.homemadetools.net/forum/...531#post225287
https://www.homemadetools.net/forum/...289#post196195
https://www.homemadetools.net/forum/...377#post204537
https://www.homemadetools.net/forum/...219#post191954
https://www.homemadetools.net/forum/...962#post179637
