If you follow the mini foundry link from this post you’ll see a video about a backyard foundry. My knowledge of foundry work and sand casting is limited to a great grandfather was a sand caster and foundries were very dangerous. But it would seem there may be a path to a metal plaque here using the glowforge to help make the mold. My only other thought is dan says the glowforge marks stone really well and you could then encase it in something that is impervious to the elements.
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