Good for mechanical parts with high impact resistance and flexibility. Sterilizable. PETG is a thermoplastic with improved properties over PLA, with high impact resistance and excellent chemical and moisture resistance. PETG can be sterilized.
Figuratively speaking, it combines the ease of use of PLA filament with the strength and durability of ABS filament. First, its strength is much higher than PLA and it is FDA approved for food containers and tools used for food consumption. Unlike ABS filament, it barely warps, and produces no odors or fumes when printed. PET filament is not biodegradable, but it is 100% reclaimable.