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Any Research on New Materials
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I went through 2kg of 72D TPU testing it in several different designs. You can find my report on Odysee, but the tldr; is it didn't work - even with design changes. I'm now exploring the capabilities of PCTG (with much better results).
But the bottom line is that some materials have limitations that you just can't design around. PETG, PC, and artistic PLA are always going to be poor choices for most functional firearms parts.
You could multi-material to cover the outside in them
makes the print sky rocket in time. i had a print i was setting up in PLA that i didnt want to have to work too much on removing supports so i was doing PLA and PETG and the print time went from 3 hours to 14 hours. need an IDEX
Yeah that is a downside