Shenzhen Alu Rapid Prototype Precision Co., Ltd.
Industry News
The short answer is: PLA itself is food safe, but 3D printed PLA parts generally are NOT recommended for food contact.
Here's why:
PLA Material Itself
PLA (Polylactic Acid) is made from corn starch or sugarcane
FDA generally recognizes PLA as safe for food contact
Biodegradable and non-toxic
Used in commercial food packaging and disposable cutlery
Why 3D Printed PLA Is NOT Food Safe
1. Layer Lines Trap Bacteria
FDM printing creates micro-gaps between layers
Bacteria, mold, and food particles get trapped
Impossible to fully clean — even dishwashing doesn't reach inside
Creates permanent contamination risk
2. Printing Process Contamination
Most filaments contain additives, colorants, and stabilizers that may not be food safe
Nozzle materials (brass) can leach lead into filament
Lubricants and residues in printer can contaminate parts
3. Porosity
FDM prints are inherently porous
Liquids and oils soak into the part over time
Factor | Recommendation |
Filament | Use food-safe certified PLA or PETG |
Nozzle | Use stainless steel nozzle (not brass) |
Colors | Use natural/undyed filament only |
Coating | Apply food-safe epoxy coating (seals layers) |
Use case | Dry food contact only — avoid liquids |
Duration | Short contact only — not for storage |
Cleaning | Hand wash only, no dishwasher |
Cannot be sterilized effectively
4. Layer Adhesion Weakness
Parts can crack along layer lines
Creates new crevices for bacteria
What Makes a 3D Print More Food Safe
If you must use 3D printed parts for food contact:
Food Safe Filament Options
Filament | Food Safety | Notes |
Natural PLA | Moderate | No dyes, use steel nozzle |
PETG | Better than PLA | More moisture resistant |
PP (Polypropylene) | Good | Difficult to print |
Co-polyester (Amphora) | Good | BPA free, FDA compliant |
Nylon (PA) | Poor | Absorbs moisture heavily |
Food Safe Coating Options
Sealing the print dramatically improves food safety:
Smooth-On XTC-3D — food safe epoxy coating
Ecopoxy — FDA compliant epoxy
Food grade silicone coating — flexible, waterproof
Polyurethane (food grade) — durable finish
Acceptable vs Not Acceptable Uses
✅ Generally OK | ❌ Avoid |
Cookie cutters (brief contact) | Cups and mugs |
Fruit bowl (dry use) | Plates for wet food |
Bread bin / dry storage | Cutting boards |
Candy molds (with coating) | Utensils for hot food |
Spice jar lids | Long-term food storage |
Safest Rule of Thumb
Scenario | Recommendation |
Dry, brief food contact | OK with food-safe filament + steel nozzle |
Wet or liquid contact | Apply food-safe epoxy coating |
Hot food contact | Avoid — PLA softens at ~60°C |
Long-term food storage | Avoid entirely |
Children or vulnerable people | Avoid entirely |
Bottom Line
PLA ≠ food safe just because the material is non-toxic. The printing process, layer porosity, additives, and bacterial trapping make most 3D printed parts unsuitable for regular food contact — especially with liquids or hot food.