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FDM Foodsafe (lemmy.ml)

submitted 2 years ago by [email protected] to c/[email protected]

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So, yes, I know that due to layer lines etc, FDM (PLA) printing isn't safe for food, however is there a way of making it safe? Essentially I want to create a draw insert for cutlery, so can I print it, the coat it in something to make it food safe?

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[–] [email protected] 8 points 2 years ago* (last edited 2 years ago) (2 children)

Others can correct me if I'm wrong, but PLA the plastic itself is food safe. As in, you can put it in your mouth and it's fine. The issue comes from the 3d printing process which tends to create small pockets and porous surfaces where microbes can hide and grow once it gets wet, kind of like a sponge. So you could print a single-use fork and eat with it, but don't reuse it later.

I think an insert for cutlery would be fine since you aren't going to be getting it wet or putting it in contact with your mouth or food.

[–] jodawznev 3 points 2 years ago

I remember reading something that matches exactly what you're saying above. The material is food-safe, but the geometry is not.

So 3d printing a cup, plate, or measuring cup is not recommended, but the cutlery insert OP is describing should be fine, no need to coat it.

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