Petg filament 3DDevice black 3.00 mm, 1 kg

The main advantage of PETG is combining the printing ease of PLA with high impact strength, heat resistance, and chemical inertness close to ABS.

Comparison of PETG with popular thermoplastics:

• Compared to PLA: although basic PLA plastic is easier to print, it becomes brittle under load and softens at just 55–60 °C. PETG withstands heating up to 75–80 °C, does not degrade under UV light, and is great for outdoor use.
• Compared to ABS: unlike engineering ABS plastic, PETG has virtually no shrinkage, does not emit toxic fumes during melting, and does not require a sealed heated chamber.
• Interlayer adhesion: PETG has one of the best interlayer bonds among all FDM polymers, ensuring high part strength along the Z-axis.

To eliminate thin threads ("stringing"), you need to precisely calibrate retraction, lower the nozzle temperature by 5–10 °C, and thoroughly dry the filament before starting.

Due to the high fluidity of molten glycol-modified polyethylene terephthalate, proper slicer settings are crucial:

• Retraction settings: for Direct extruders, set a retraction distance of 0.8–1.5 mm; for Bowden systems, 4–6 mm at a speed of 35–45 mm/s;
• Temperature mode: avoid overheating — print at the minimum allowable temperature that maintains strong layer bonding (usually 225–235 °C);
• Travel speed: increase travel speed to 150–200 mm/s so the nozzle breaks away from the print area faster;
• Nozzle control: if the nozzle is worn or has carbon buildup, the filament will cling to the metal. If necessary, replace the consumable by choosing new nozzles in the 3D printer spare parts section.

The optimal nozzle temperature for PETG ranges from 225 °C to 245 °C, and the print bed temperature ranges from 70 °C to 85 °C.

To achieve high surface quality and maintain part strength, follow these parameters during FDM 3D printing:

• First layer: extruder temperature 235–240 °C, bed temperature 80 °C without cooling for reliable part fixation;
• Main layers: working nozzle temperature 230 °C, bed temperature 75 °C;
• Part cooling: limit fan speed to 20–50%. Excessive cooling leads to a sharp drop in interlayer adhesion and makes the part brittle, while complete lack of cooling can cause sagging of bridges and fine details.

To safely remove a PETG print without damaging the build plate, always use a separation adhesive layer and wait for the bed to cool down completely to room temperature.

PETG has extremely strong adhesion to glass, mirrors, and smooth PEI coating. Printing on a clean surface can cause the plastic to tear off chunks of glass or damage the film upon removal. Rules for safe removal:

• Use a release barrier: before heating, apply a thin layer of special 3D lacquer or glue available in the 3D accessories category — glue acts not only for fixation, but also as a release layer during cooling;
• Natural cooling: do not force the part off a hot bed. Wait until the platform cools down to 25–30 °C — in most cases, the part will pop off automatically due to the difference in thermal contraction coefficients;
• Quick release: if the part still holds firmly, drop a few drops of isopropyl alcohol under the edges of the part or place the removable sheet in a freezer for 5–10 minutes.

Yes, PETG is hygroscopic and actively absorbs moisture from the air, so before critical printing it must be dried at 60–65 °C for 4–6 hours.

Signs that the plastic spool has absorbed moisture from the environment:

• A clicking and slight crackling sound is heard as the filament exits the extruder;
• Steam rises from the nozzle, and the molten plastic foams or forms micro-bubbles;
• Transparent or translucent PETG becomes cloudy and loses its gloss after printing;
• The material's tendency to form parasitic stringing increases, and the part walls become rough and brittle under tensile stress.