PETG (Polyethylene Terephthalate Glycol) is a durable, versatile thermoplastic known for combining the benefits of both PLA and ABS (another common filament). It's stronger and more flexible than PLA, making it more suitable for functional parts that need to withstand some stress or impact. PETG is also more heat-resistant and offers good layer adhesion, resulting in strong prints. While it prints easily, it can sometimes be stringy due to its higher printing temperature. It's often used for mechanical parts, protective components, and items that require some degree of resilience.