Laser hardening glass bottle molds.
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Previously:
https://www.homemadetools.net/forum/...430#post224892
https://www.homemadetools.net/forum/...014#post217601
https://www.homemadetools.net/forum/...637#post209429
https://www.homemadetools.net/forum/...173#post199577
https://www.homemadetools.net/forum/...792#post190531
