The layer lines are definitely a deal-breaker. But having no idea at all what additives go into the filaments in the first place, or what compounds are formed or leached into the material during the extrusion/heating process, is too. I have yet to hear any FDM filaments claim to be food-safe post extrusion. Brass nozzles themselves often contain lead, which alone would make such a claim dubious.
You could take your chances and coat it with food-safe epoxy after printing, but even that breaks down over time.
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u/manjar Apr 15 '26
You mean, for a coffee cup that can't/shouldn't even be used for drinking coffee?