PETG offers good impact resistance and strong layer adhesion, plus reliable chemical and moisture resistance. It is a good choice for everyday functional parts.
PETG is made by modifying polyethylene terephthalate (PET) with glycol, which makes it notably more impact-resistant while avoiding the brittleness that can affect standard PET.
Compared to PLA, PETG offers greater durability and flexibility, which makes it the better choice for parts that need to withstand everyday handling, stress, or impact. It also holds up well against moisture and many common chemicals.
PETG suits moderate outdoor or shaded use, but prolonged direct sun exposure can cause gradual yellowing; for parts that need long-term UV durability, ASA would be the better fit.
PETG is a good choice for protective enclosures, storage containers, and mounting brackets.