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Sagexs

is PLA and ABS food safe?

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Unless you can get a MSDS from the place you're buying it from that says that it is, then no. There are materials that are classified as safe for food contact such as Colorfabb's XT. However, that's only half the story. Is the rest of your system completely safe? Are there any contaminants in the chain? Will your nozzle release anything into the plastic? Do you have remnants of other stuff in your bowden/nozzle/feeder that could get into the print?

But more importantly, the surface of a print is a great place for nasties to grow. It's not a completely smooth surface, there are print lines, pockets of air, they're often not completely water tight etc etc.

And then there's the problem of hot coffee melting/deforming your print because it's simply too hot. And I assume you'll want to put it in the dishwasher which would also destroy it (at least in the case of PLA).

For the moulds you could maybe make intermediate moulds out of plastic. Post process them so they are nice and smooth and then create silicon moulds from them?

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Afaik, Taulman's Nylon filaments are certified food safe. Check their homepage to be sure if you're interested.

The problem with PLA filaments not being food safe is not the PLA (which is a food safe plastic), but the additives such as the color pigments. I read somewhere that especially neon green and orange colors are pretty nasty..

/edit:

I'd recommend Colorfabb's XT for the coffee mug. Should be able to withstand the temperature. It might be a problem if you put boiling hot water into the mug.. (interesting experiment though :p)

I'm not sure if the food safety certificate only applies for the clear XT, or also the colored ones. Make sure before you buy!

Edited by Guest

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I believe filaments can be food safe before they are submitted to the print process.

During the print process, if your print profile is not perfect (like to hot) it can carbonise

the filament making it not food safe. Then, you also have IRobertsI answer where the surface has a lot of room for nasties.

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