Are there materials that I can print with that are food safe?
Can I use my 3D prints for use with food items?
No. While the materials that you use to print with might generally be food safe (e.g. PETG), the resulting prints are not advised for use or contact with food.
The 3D printing and extrusion process itself can contaminate the print with oils and grease as well as small bits of metal, PTFE and micro-plastic. The additive FDM process itself leaves too many nooks and crannies for bits of food and bacteria to collect.
The Reddit r/3DPrinting Bot provides the following automated response:
While PolyLactic Acid (PLA) and PolyEthylene Terephthalate Glycol-modified (PETG) has been classified as Generally Regarded As Safe (GRAS). There's a lot of uncertainty around the process of additive manufacturing.
Some testing shows that the layer lines are big enough that bacteria don't hide inside as much as expected. Additionally, it's not nearly as porous as initally expected. Some soap and water with scrubbing is enough to clean most of it out and a quick wash with a bleach solution can bring it up to almost medical standards.
This does not take into account material impurities. New nozzles can come with a coating (often PTFE) to prevent blobs from sticking. The abrasives in the filament can wear this coating down and while it is safe for food to contact like on a frying pan, the worn down products are not.. It also wears the nozzle and metal particles can end up in the print.
TL;DR: Use a sealer. Or don't. I'm a bot, not a cop.