I've actually read that resin printed parts are not food-safe in Reddit and Formlabs guide. However, it also says that food-safe can be achieved applying some kind of food-safe coat to the printed parts, or even printing with ceramic resin.
As an owner of a Elegoo Mars Pro, I've searched for the second - ceramic resin - and I've found nothing, so I guess it's only suited for more expensive and professional printers.
But regarding the food-safe coatings, is there any recommendation on which and how to apply them for resin printed objects? Is there any other way to achieve food-safe resin printed parts? Maybe are there food-safe resins, even though they may be more expensive (I haven't been able to find any)?
The scenarios I think that have to be considered are four:
- Prints to be used for liquids: like mugs and coffee cups, or recipients to hold drinks in the fridge, for example.
- Prints to be used for solids: just recipients to put dried fruits, nuts, olives...
- Prints to be used while eating, which some tools may interact with: plates, bowls, which will be in contact with knifes, forks, and some other material that could scratch it.
- Prints to be in contact with the mouth: this would be maybe a mix of the other, but would include forks, spoons, mugs...
I guess that the cleaning and maintenance will depend on the process to make them food-safe.
I've been searching for the net, and I've found these kind of epoxy resins. I see people use them and say it's food-safe, but I cannot see it stated anywhere. Maybe are those what I'm looking for? Maybe not because some of them are for wood (maybe they can be used in other suraces, too?)? Some samples:
Hope to find a little bit of knowledge to increase safety when printing some parts and being careful about the different applications that our prints may have.