PETG is often recommended over PLA for outdoor prints due to its superior durability and resistance to UV rays. While PLA is a popular choice for its low cost and ease of use, it is less suitable for exposure to harsh weather conditions.
In terms of thermal resistance, PETG outperforms PLA, with a glass transition temperature of approximately 85ºC compared to PLA's 60ºC. This difference can be critical for items left in hot environments, such as inside a car, where PLA may soften or deform.
Moreover, PLA is more brittle, making it prone to shattering under impact, while PETG offers enhanced strength and resilience for items subjected to sudden forces. For prints that will encounter chemicals or solvents, especially in workshop settings, PETG is the preferred filament due to its chemical resistance.