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Of all my articles, this one is probably the broadest in scope, which is why it took nearly three months to write. Lots of discoveries along the way though, and I'm happy with the results.
Are you leaving the PLA molds in when you pour the molten alloy? I can't picture how you made that cup without metling or cutting the mold! Great addition to your projects
Nope, no lost-PLA here. The cup is actually a bell, so if you imagine it sitting upright you can picture how it could get pulled upward, leaving behind the lump of sand that was inside.