Note: Commercial PLA filament is usually not food-safe in the final print. At 3D Druck München, we use a special certified filament and print under food-safe conditions – so you can have safe kitchen tools produced.

In short: Standard PLA is rarely truly food-safe in practice. With certified filament, suitable printing components and dishwasher-safe FDM printing, you can have safe parts for direct food contact manufactured – this is exactly the service provided by 3D Druck München.

Is PLA food-safe?

More and more 3D-printed objects are used in our homes. Whether it’s a new soap holder, a tube squeezer or practical helpers in the kitchen, creativity knows few limits – as shown by our list of 100 3D printing ideas. But how safe is PLA for items used in the kitchen? This article takes a closer look at the topic.

3D Druck München offers 3D printing with food-safe filament. This material is dishwasher-safe, UV-stable, certified for direct food contact and compliant with REACH and RoHS. In the online calculator, you can simply select the material option “food-safe”. Order food-safe PLA 3D prints now Certified, safe and dishwasher-safe

What exactly does “food-safe” mean? The term is often used in connection with food packaging, but at 3D Druck München we go one step further. Our innovative material sets new standards in food-safe 3D printing – ideal for your creative and everyday kitchen helpers from the 3D printer. Legally, we are talking about so-called “food contact materials”, i.e. objects that can come into contact with food or are expected to do so.

Is PLA a food-safe plastic?

The question is whether PLA (polylactide), the most frequently used plastic in 3D printing, is food-safe. PLA is a bio-based plastic made from lactic acid. The required starch is obtained from plants such as corn, sugar beet or potatoes. This sounds like a very suitable material at first.

With regard to disposal, PLA also seems unproblematic: according to EN 13432 it is industrially compostable. In an industrial composting facility, no toxic residues remain. However, because the decomposition process takes several months, PLA still must not be disposed of with household bio-waste.

So at first glance, PLA sounds like a food-safe plastic, doesn’t it?

Can molecules migrate into food?

To assess food safety, no harmful substances may migrate from the plastic into food. The migration of substances from PLA into food was already investigated in 1995 in the study “Safety assessment of polylactide (PLA) for use as a food-contact polymer”.

The aim of the study was to determine which diffusion may occur in the worst case when PLA is used in household items at different temperatures and as packaging material. Both short- and long-term tests were carried out. The samples were heated up to 60 °C to simulate contact with warm dishes.

The result was that PLA can be considered safe for food contact. PLA releases a small amount of lactic acid, which was detected in the food. Lactic acid is a common food component. It was estimated that additional lactic acid intake from PLA is about 700 times lower than the lactic acid intake of breastfed infants. So far, so good.

How does it look in real-world applications?

Due to material optimisation and colour additives, PLA used in practice can contain substances that – unlike in laboratory tests – may migrate into food. Therefore, you should rely on certified filament manufacturers who have their material explicitly tested and certified for food contact.

During the printing process, the plastic is guided through a hotend to form the model. Standard 3D printers usually use brass nozzles, which are not food-safe. They wear out and are treated as consumables. In this case, a hotend made of stainless steel or titanium is the better choice. In addition, small corners inside the nozzle can trap plastic residues, which can form harmful degradation products under prolonged heat exposure.

Another important aspect in the question of whether PLA is food-safe concerns the additive manufacturing process itself: due to the layer-by-layer build-up, every model has numerous small grooves where bacteria can accumulate and multiply. Only when the model is coated with a food-safe, smooth coating can it be used long-term without concern. High temperatures (for example in the dishwasher) can significantly reduce the bacterial load. For comparison: a regularly used cutting board probably has deeper grooves and more contamination than an FDM 3D print.

Comparison of a food-safe FDM 3D print vs a cutting board. The FDM surface is more hygienic than that of a typical cutting board.

Standard PLA is also not dishwasher-safe. Dishwashers often reach temperatures above 60 °C, at which the material can soften and deform. However, there is a bright spot: ceramic 3D printing is on the rise. In future we may see more 3D-printed tableware. The food-safe plastic offered by 3D Druck München in the calculator is demonstrably dishwasher-safe.

In addition to the FDM process, there are SLS/SLM and SLA processes, which work with powder or liquid resin. After printing, excess powder or resin must be removed. There is a risk that microplastics or resin residues remain on or in the product. Even if the surface is very smooth, resin residues can still migrate into food. For this reason, FDM printing is usually the most suitable process when you want to use 3D prints for food contact. If support structures are required, however, there will be locally higher surface roughness, which increases the tendency for bacteria to settle. Therefore, it is important that the 3D print is dishwasher-safe and cleaned thoroughly on a regular basis.

Innovative applications for food-safe 3D printing

3D printing offers a wide range of possibilities to enrich and personalise everyday life. Particularly in the area of food-safe products, exciting applications are emerging. Here are some inspiring ideas for how you can use the technology:

• Cookie cutters: With individually designed cookie cutters made from food-safe material, you can create baked goods in shapes that reflect your personality and bring a smile to every occasion. Watermelon cutters are also very popular in summer.
• Chocolate moulds: 3D-printed chocolate moulds allow you to create chocolate art with complex, detailed designs that go far beyond the options of traditional moulds.
• Aquarium accessories: Decorate your aquarium with safe and stylish 3D-printed elements that enrich underwater life without affecting water quality. Technical applications are also possible here.
• Food packaging: Take advantage of the biocompatible properties of PLA/PHB to create sustainable, safe containers for storing food.
• Modular storage systems: Bring order to your kitchen with modular systems that fit perfectly into your cupboards and keep spices, herbs or other ingredients organised.
• Personalised praline moulds: Give your pralines a personal touch by printing individual moulds for these sweet treats.

These applications show how 3D printing technology can help make working with food not only safer and more practical, but also more creative and individual.

Have your 3D prints produced from food-safe plastic by 3D Druck München. Order food-safe 3D printing now

Conclusion

All in all, PLA has good basic properties for food-safe 3D printing. However, colour additives, printing parameters and the manufacturing process can mean that this food safety is not fully maintained in the finished part. You should therefore not use standard PLA for direct contact with food without further consideration.

For small kitchen helpers such as bag clips, spice racks or coasters, PLA is still an excellent 3D printing plastic. When it comes to direct food contact, however, a certified, dishwasher-safe and food-safe filament in combination with suitable printer components is the better choice.

3D Druck München offers 3D printing with filament that is suitable for direct food contact and comes with the relevant certifications. If you have a specific project in mind, simply upload your file to the online calculator and select the food-safe material – you will receive the price within a few seconds.

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