3DPrinting

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Waterproofing PETG prints? (slrpnk.net)

submitted 1 day ago by solbear@slrpnk.net to c/3dprinting@lemmy.world

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I recently printed a vermicomposter in PETG. It consists of a bottom reservoir which is supposed to catch leachate from the above compartments. I'm not sure the rate at which this will fill up, but the leachate is supposed to be diluted with water and used as nutrients from plants.

However, the reservoir leaks from the plug and from the front leg slots, at least when the reservoir is filled completely up with water. The leak from the plug I seem to have fixed with a combination of an o-ring and some PTFE-tape, but for the other leak I've been thinking of coating it with epoxy resin.

My challenge is actually finding such a resin, where the finished, cured product is food safe (since it will eventually find its way into the plants I intend to eat). Locally, I've not been able to find anything that is certified food safe, only various epoxy fillers and primers for boats.

The local 3D-print shop recommended this product which I could get through them: https://siraya.tech/products/siraya-tech-aegis-coating-systerm-for-resin-filament-prints But I've found some less than favorable reviews for that one in particular.

Anyone with experience water-tightening containers like this?

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[–] grue@lemmy.world 1 points 22 hours ago

Locally, I’ve not been able to find anything that is certified food safe, only various epoxy fillers and primers for boats.

Call the manufacturer of the locally-available epoxies and ask them what they recommend.

I went looking for contact info for one common brand as an example, but found instead this product support article that suggests, to me at least, that their "limited food contact"-rated epoxies would be good enough for your use-case.

(I never did find a phone number or email for product support, but they do at least have a chat widget, so... 🤷)