Food-Safe 3D Printing: What PLA and PETG Can Really Do
are explained briefly when you hover over or tap them.
The honest answer: a filament can be suitable as a raw material for food contact. A printed part is still a long way from being so. Prusa and Polymaker both advise against repeatedly using printed parts for eating and drinking. Short, dry contact, as with a cookie cutter, is defensible. For cups, plates, tins or chopping boards, an FDM print is not suitable without further measures.
Why that is, and what you can do if a part really is to touch food, is explained below.
What “food safe” means for filament
In the EU, the basic rules of Regulation (EC) No 1935/2004 apply to all materials in contact with food. Under normal or foreseeable conditions they must not release constituents into food in quantities that endanger health or change taste and composition unacceptably. For plastics, Regulation (EU) No 10/2011 makes this specific, with lists of authorised substances and limits for migration, that is, for what may pass from the plastic into the food.
Manufacturers demonstrate compliance with a declaration of conformity. According to the Federal Office of Consumer Protection and Food Safety (BVL), it must be available in writing at all stages of trade except retail, including for starting products. The responsible business operator issues it and must present supporting documents such as test conditions and analyses to the authorities on request.
An example shows what this means in practice: in its regulatory data sheets for PLA and PETG, Extrudr certifies that the composition of the product meets the requirements of Regulation (EU) No 10/2011. At the same time, the technical data sheet states that the certification depends on the colours in the final product. The declaration therefore concerns the material as it leaves the manufacturer, not your printed part.
You should also know two other things:
- “FDA compliant” is not an EU statement. Many filaments advertise with the US authority FDA. Polymaker writes that there is no FDA certification specifically for 3D printing materials and that, for food safety, what counts in the end is the finished object, not the raw material.
- Only a few manufacturers have their products certified. Prusa writes that many materials are considered food safe, but only a handful of manufacturers have gone through the costly certification process.
Why the printed part is the problem
Layer grooves and bacteria
FDM prints consist of layers with fine grooves and gaps between them. Food residue settles in them, and bacteria can multiply. Polymaker writes that such parts can hardly be cleaned reliably; a part might still be defensible for single use, but hardly for repeated contact. Prusa recreated this in its own test with a printed PLA cup and concludes: smaller layer heights and 100 % infill help, but are never enough.
The nozzle
Common nozzles are made of brass. Polymaker and Prusa point out that brass contains lead and abrasion can be transferred to the printed part. Prusa also says this of hardened steel nozzles and recommends a stainless steel nozzle for food applications. In addition, a nozzle that other materials have previously run through can, according to Polymaker, carry residues of them into the new print. Prusa recommends cleaning the hotend thoroughly beforehand, for example with a cold pull. Which nozzles are available is covered under Nozzles for 3D printers.
Dyes and additives
The base material may be suitable, but dyes, fillers or modifiers may not be. Polymaker explicitly names pigments and additives as a risk. For individual Prusament colours, Prusa obtained confirmation from the dye manufacturer and lists these colours individually. This does not automatically apply to effect filaments such as silk, glitter, wood or metal.
Heat and dishwasher
According to Polymaker, prints can deform, release substances or age after dishwasher cycles, hot water or repeated heat. According to the Prusament data sheet, PLA has a heat deflection temperature of only 55 °C. Which materials tolerate how much heat is covered under Heat- and UV-resistant filament.
Which material?
Prusa names PLA, PETG and PP as materials that are considered fundamentally harmless even without certification, and advises against direct food contact for most ABS and ASA filaments. Polymaker describes ABS as unsuitable for food and TPU without certification as unsuitable for kitchen accessories.
What matters, however, is not the material name but the manufacturer’s declaration for exactly this type and colour. If in doubt, ask the manufacturer for a declaration of conformity under Regulation (EU) No 10/2011 and read what it applies to: which foods, which temperatures, which contact time.
Coating: the only way to smooth surfaces
Prusa writes: without a surface coating, no print is food safe. The grooves can be sealed with a clear epoxy resin that is approved for food contact. For this, Prusa used a resin certified under Regulation (EU) No 10/2011 and warns:
- Use only certified resin. Many epoxy resins are not approved for food.
- Liquid resin is toxic, and so are approved resins if they are not fully cured. Follow the manufacturer’s mixing ratio and curing time exactly, wear gloves and respiratory protection.
- Limits remain: Even coated, the parts are, according to Prusa, not suitable for chopping boards because they get scratched, and not for hot soup, the microwave or the dishwasher.
Polymaker adds that a coating only helps if it is itself approved for food contact and applied correctly. Otherwise you only add another unknown layer.
Resin prints are not an alternative: Prusa considers most SLA resins unsuitable both in liquid and in cured form.
What makes sense in practice
| Use | Assessment |
|---|---|
| Cookie cutter, dough stamp, short dry contact | defensible, Polymaker names such uses as low-risk |
| Cake decoration, display objects | defensible if there is no longer contact with moist food |
| Form or model for a silicone mould | sensible: Polymaker advises using the print as a prototype or mould, not as a contact surface |
| Cups, plates, cutlery, storage tins | not advised: repeated contact, cleaning, heat |
| Chopping board | no, not even coated (Prusa) |
| Pet bowl | not advised, Polymaker explicitly names it as a problem case |
If you sell printed kitchen items
Anyone who places items in contact with food on the market must ensure that they meet these regulations. Regulation (EC) No 1935/2004 requires that such items are made according to good manufacturing practice, and Regulation (EC) No 2023/2006 regulates this practice in more detail. For plastics, the documentation under Regulation (EU) No 10/2011 is added. A data sheet from the filament manufacturer does not replace it. Get advice beforehand from the food inspection authority of your district or city. What else applies when selling prints is covered under Am I allowed to sell 3D prints?
In short
- A filament with a declaration of conformity is a good starting point, but does not make the printed part food safe.
- The problems are layer grooves, nozzle abrasion, dyes and heat.
- Short, dry contact is defensible, everyday tableware is not.
- Anyone who wants more needs a stainless steel nozzle, a clean hotend, suitable filament and an approved coating, and even then limits remain.
More on myths about PLA and food is in 7 myths about 3D printing, general safety rules in Safety in 3D printing.
Sources
- Bundesamt für Verbraucherschutz und Lebensmittelsicherheit: Information on the declaration of conformity for plastic food contact articles (PDF)
- Prusa Blog: Making food-safe 3D print models
- Prusa Knowledge Base: PLA, PETG
- Polymaker Wiki: Food Safety, No Material is FDA Approved as Food Safe, ABS, TPU
- Extrudr: Regulatory Information Sheet PLA Basic (PDF), Regulatory Information Sheet PETG (PDF), Technical data sheet PETG, German (PDF)
- Prusament: PLA data sheet (ZIP with PDF)