PETG is the ultimate “all-rounder” material for FDM printing. It combines the ease of use of PLA with the mechanical strength of ABS, offering excellent chemical and weather resistance. It is the ideal choice for functional parts, outdoor gear, and components requiring durability.
Why choose PETG?
- Balanced Performance: More heat-resistant and tougher than PLA, yet far easier to print than ABS without needing an enclosure.
- Superior Layer Adhesion: PETG has exceptionally strong layer-to-layer bonding, making it virtually immune to delamination.
- Chemical Resistance: Highly resistant to acids, alkalis, and many solvents. Often rated for food-safe applications (check specific brand certifications).
- Transparency Options: Many PETG filaments are available in translucent or clear variants, perfect for lampshades or light-transmitting components.
When NOT to use PETG?
- Stringing Issues: PETG is prone to “stringing” caused by excessive retraction or moisture. It may not be the best choice for models with highly intricate geometries.
- Over-Adhesion: On glass surfaces, PETG can bond so strongly that it may take chunks out of the glass. Using a PEI sheet or applying a release agent (like glue stick) is recommended.
- Fine Detail: For models with extremely sharp corners or tiny details, PETG’s visual performance is typically slightly lower than that of PLA.
Best Practices
- Print Temp: 230°C – 250°C
- Bed Temp: 70°C – 85°C
- Cooling: 30% – 50% Fan Speed (Lowering fan speed increases strength but may increase stringing).
- Storage: PETG is highly hygroscopic. Moisture absorption leads to bubbles and severe stringing; store in a vacuum-sealed bag with desiccant.