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Google Rapid Prototyping and see what you find. Dow Corning and Shin Etsu Silicones used to have a pretty good mold making material. You may also find some info on the Conap site.
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Michael D. Holloway
https://simple.m.wikipedia.org/wiki/Michael_D._Holloway
https://5thorderindustry.com/
https://www.amazon.com/s?k=michael+d+holloway&crid=3AWD8RUVY3E2F&sprefix= michael+d+holloway%2Caps%2C136&ref=nb_sb_noss_1
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