Printing Functional Kitchen Items: Food Safety Considerations

Jackson B.

Is FDM Food Safe?

The question of food safety in FDM printing is nuanced and frequently misunderstood. The short answer: FDM prints can be made to a food contact standard, but the default process, using a standard brass nozzle and any common filament, is typically not food safe by any meaningful standard. Getting to genuine food safety requires deliberate choices at every stage: material, hardware, and post processing. Understanding what's required lets you make informed decisions about where 3D printing is and isn't appropriate for kitchen and food applications.

The Three Requirements for Food Safety

Requirement 1: Food-safe material. 

• PETG is the most practical food safe FDM material, as its base polymer is approved for food contact (it's what food grade water bottles are made from).
• Many (but not all) PETG filaments contain dyes and additives that are not food grade, ensure that you verify with the manufacturer's documentation before assuming food safety.
• PLA base polymer is technically food safe (it's used in biodegradable food packaging), but most coloured PLA filaments contain non food grade pigments. Natural or translucent PLA from documented food safe formulations is safer.

Requirement 2: Stainless steel nozzle. 

• Standard brass nozzles contain lead in their alloy, which is not food safe. We recommend using a stainless steel or food grade nozzle specifically for food contact applications.
• Hardened steel nozzles may use alloys that are not food safe; make sure that you verify with the nozzle manufacturer.
• Stainless steel nozzles from reputable suppliers are available specifically marketed as food safe options.

Requirement 3: Surface sealing. 

• FDM layer lines create micro gaps that trap bacteria and are impossible to sanitise through dishwashing or surface cleaning. This is the fundamental limitation of FDM for food contact: even with perfect material and hardware, the surface texture creates unhygienic crevices.
• Seal with a food safe epoxy (clear two part epoxy resin labelled food safe after full cure) to create a continuous, smooth, cleanable surface.

Appropriate Applications

With all three requirements met, appropriate food contact applications include the following: cookie cutters (brief, one time contact, rinsed immediately), vase or cup forms that hold food but aren't in sustained contact, single use or disposable serving items, and decorative cake toppers that don't contact the edible portion. Inappropriate applications: daily use plates, cups, or cutlery; containers for food storage; anything that will be machine washed without coating; or any item in contact with hot food (most food safe coatings break down under sustained heat). See our material guide for general material properties and our safety guide for the broader safety context of 3D printing at home.