3DPrinting

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3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.

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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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[–] DoubleDongle@lemmy.world 1 points 1 day ago

I've made a couple drinking vessels with food-safe epoxy. Been meaning to try food-safe polyurethane too. And a guy who makes drinking horns has told me that shellac is naturally food-safe too. I don't 100% believe him but I used it on my horn anyway and water tastes okay out of it.