The most common misunderstanding in 3D printing is treating a material certificate as a certificate for the printed object. They are not the same thing.
The material and the part are different questions
PLA and PETG base polymers are used in food packaging and can carry food-contact approvals in specific grades. A desktop FDM part is produced in an open environment, layer by layer, and that process introduces risks the resin approval does not cover.
Two risks dominate
Microbial. Layer lines form microscopic gaps that trap food residue and moisture. They cannot be reliably cleaned, even in a dishwasher, so bacteria can colonise the surface.
Chemical. Most desktop printers ship with a brass nozzle, and brass commonly contains trace lead as a machining additive. Colourants and additives in the filament may also not be approved for food contact. Printing abrasive material through the same nozzle adds wear particles to the melt stream.
What reduces the risk
- Use a dedicated stainless steel nozzle and filament path reserved for food-contact work.
- Choose grades with documented food-contact approval rather than assuming a colour is safe.
- Seal the surface with a certified food-safe coating where the application allows it.
- Prefer PETG over PLA for anything that sees repeated handling or warm liquids.
- Avoid hot liquids and long-term storage of acidic food in printed containers.
If you intend to sell
For commercial products, the finished item normally has to be tested and certified against the rules of the destination market. No material supplier can certify your printed part for you. Treat the filament as one input, and plan the compliance step deliberately.
FilamentLab material grades list the documentation available per product. Ask our team if you need material documentation for a compliance file.