The PETG material is essentially the same as the known PET material from which PET bottles are made. The G in the acronym PETG stands for Glycol which is added during the manufacturing process. Glycol modifies the properties of PET so that it’s easier to print and less brittle. It is a strong and tough material, which is characterized by good thermal stability.
Thanks to the small shrinkage during printing, it is suitable for printing large objects.