PET is a common material, often found in rigid bottles for low-temperature goods such as peanut butter or sports drinks. It is the most readily accessible semi-crystalline polymer and is therefore difficult to print. Recent development of filled (CF/GF) PET filaments have resolved much of the printability issues inherent to pure PET.

• Reasonable value for temperature resistance
• Broad color variety
• Filled PET printable on machines without enclosure

• Requires post-processing (annealing) for best performance
• Pure PET is difficult to work with

Standard guidance on additives applies to an extreme degree.

Information on PET(-GF/-CF) specific annealing here. Placeholder: We recommend 120C annealing, which produces parts good to ~100C. Higher temperatures are more difficult to process PET parts with, but yield parts with greater temperature resistance.

These numbers are provided as a baseline, and need adjustment and calibration for your specific printer/filament/color combination.

PET has powerful adhesion to PEI sheets. It is highly recommended to use an interface material like PVA (generic glue-stick) or other products to prevent PEI sheet damage.