The blue PETG filament (1.75 mm) is ideal for 3D printing strong objects. PETG is a hydrophobic (water-repellent) material and has low shrinkage, which significantly improves printing. PETG is recyclable, can print objects in any shape, has very strong mechanical properties, and a beautiful glossy finish. Use of a heated bed is optional.
Read more about printing with PETG filament
here .