I don't think that piece of plastic would last as long as you think. I think even ABS or PETG would be crumbling to powder in 100 years.
But you could use it as a stamp for thin sheet metal, that might last a longer time.
But you could use it as a stamp for thin sheet metal, that might last a longer time.
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"Standard estimates for indoor PETG longevity are 10–20+ years under normal conditions, with some sources giving a more conservative 5–10 years. A century is 5–10x beyond those estimates under passive conditions." Wow! Thanks for pointing this out. This is fascinating.