a petg filament that is the strongest

The strongest PETG filament options we have are the PETG-CF (Carbon Fiber Reinforced PETG) filaments, which offer maximum stiffness, strength, and outstanding dimensional stability. These filaments significantly reduce flex, creep, and warping while providing a premium matte finish and excellent layer adhesion. They are easier to print than most high-end engineering materials and are ideal for applications requiring maximum strength and rigidity. We have PETG-CF in Black from both 3D Printing Canada and Bambu Lab, the latter being noted for reduced clumping and smooth extrusion.

Another very strong option is the PETG-GF filament, which is glass fiber reinforced for increased rigidity and strength, with improved dimensional stability and resistance to deformation compared to standard PETG.

If you want the absolute strongest PETG, I recommend the PETG-CF filaments for best strength and stiffness.