It combines the durability of ABS with the easy printability of PLA, making it ideal for a range of applications, from functional prototypes to household items. However, PETG filament does come with its own set of challenges, which can be effectively managed with the right printing tips.

Optimal Bed and Nozzle Temperature

For successful PETG prints, maintaining the correct temperatures is essential. A nozzle temperature between 230°C and 250°C is usually optimal for achieving smooth extrusion without under- or over-extruding. Additionally, setting the bed temperature between 70°C and 80°C can improve adhesion, helping the print stick to the bed while preventing warping. Some users also benefit from using a heated chamber, especially for larger prints, as this minimizes thermal contraction.

Perfecting Bed Adhesion

PETG has excellent bed adhesion properties, sometimes even too good! To prevent the print from sticking too tightly and potentially damaging the bed surface, consider using a release agent like glue stick or blue painter’s tape. A smooth print bed, such as glass, also works well with PETG, giving it a clean bottom surface while allowing for easy removal once cooled. Adjusting the initial layer height slightly higher than usual can also prevent excessive adhesion.

Managing Stringing

PETG is known for its tendency to string due to its viscosity and the way it cools. To reduce stringing, fine-tune the retraction settings. Generally, a retraction distance of 5 to 7 mm and a retraction speed between 25 to 35 mm/s can significantly help minimize unwanted filament oozing. If stringing persists, consider lowering the print temperature slightly, as higher temperatures often cause more stringing.

Print Speed and Cooling

PETG performs best at moderate print speeds, usually between 40 to 60 mm/s. Too high a speed can lead to poor adhesion between layers and increased stringing, while too low a speed may result in over-extrusion. When it comes to cooling, use a low to moderate fan speed (30-50%) to balance strength and prevent warping. Excessive cooling can cause layer separation, so adjusting gradually based on part geometry can yield the best results.

Post-Processing PETG

If your PETG prints have stringing or rough surfaces, a light sanding with fine-grit sandpaper can improve aesthetics. Unlike PLA, PETG is resistant to acetone smoothing, so mechanical sanding or polishing is often the best post-processing approach.

Mastering these PETG printing tips can help you achieve consistently high-quality results. With the right settings and careful preparation, PETG filament can produce strong, reliable parts that look and perform well.