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Polyethylene Terephthalate Glycol-modified (PETG) has established itself as the indispensable "middle ground" in additive manufacturing. By incorporating glycol into the PET base—the same polymer used in beverage containers—PETG overcomes the brittleness and crystallization issues of standard PET. This results in a material that combines the effortless printability of PLA with the functional durability and thermal resistance of ABS.
Why choose PETG over PLA or ABS? PETG offers superior impact resistance and chemical stability compared to PLA, while remaining significantly easier to print than ABS due to its low shrinkage and minimal warping. It is the definitive choice for functional prototypes, mechanical brackets, and outdoor components that require long-term UV stability without the complexity of an enclosed printing environment.
PETG is characterised by its "sticky" melt behavior, which provides exceptional interlayer adhesion but requires specific handling to achieve professional surface finishes.
Exceptional Layer Bonding: PETG creates some of the strongest Z-axis bonds in FDM printing. This makes parts nearly isotropic in strength, though it can make support removal more challenging compared to other materials.
Chemical & UV Resistance: Naturally resistant to many acids, alkalis, and alcohols, PETG is suited for laboratory fixtures and automotive interiors. Its inherent UV resistance ensures that parts will not become brittle or discoloured when exposed to Australian sunlight.
Hygroscopic Nature: PETG is highly sensitive to moisture. We observe that even a few days of exposure to ambient humidity can lead to "popping" at the nozzle and increased stringing. We recommend drying PETG at 65°C for 4–6 hours prior to critical functional prints.
