Polyethylene terephthalate (PET) is the most commonly used plastic in the world. Best known as the polymer used in water bottles, it is also found in clothing fibres and food containers. While “raw” PET is rarely used in 3D printing, its variant PETG is a popular 3D printer filament.
Like any 3D printing filament material, there’s a plethora of brands offering their own colors, blends and properties.
The ‘G’ in PETG stands for “glycol-modified”, and the result is a filament which is clearer, less brittle, and most importantly, easier to use than its base form. For this reason, PETG is often considered a good middle ground between ABS and PLA, the two most commonly used types of 3D printer filament, as it is more flexible and durable than PLA and easier to print than ABS.
Three things 3D printer enthusiasts should keep in mind when using PETG:
- PETG is hygroscopic, meaning it absorbs moisture from the air. As this has a negative effect on printing, make sure to store the 3D printer filament in a cool, dry place.
- PETG is sticky during printing, making this 3D printer filament a poor choice for support structures, but good for layer adhesion. (Just be careful with the print bed!)
- Though not brittle, PETG scratches more easily than ABS.
Polyethylene coTrimethylene Terephthalate (PETT) is another PET variant. Slightly more rigid than PETG, this 3D printer filament is popular for being transparent.
- Filament Weight: 1kg
- Filament Length: 400m approx.
- Filament Diameter: 1.75mm
- Printing Temperature:
- Nozzle: 220-240°C
- Heatbed: 70-80°C
- Various colors to be chose from
- Strength: High| Flexibility: Medium | Durability: High
- Difficulty to use: Low
- Print temperature: 220°C – 250°C
- Print bed temperature: 50°C – 75°C
- Shrinkage/warping: Minimal
- Soluble: No
- Food safety: Refer to manufacturer guidelines
When Should I Use PETG (PET, PETT) 3D Printer Filament?
PETG is a good all-rounder but stands out from many other types of 3D printer filament due to its flexibility, strength, and temperature and impact resistance. This makes it an ideal 3D printer filament to use for objects which might experience sustained or sudden stress, like mechanical parts, printer parts, and protective components.