Getting Started With PETG Filament 3D Printing

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Polyethylene terephthalate glycol, or PETG filament, is one of the popular filament materials used in fused deposition modeling (FDM 3D printing). It offers improved material properties compared to Polylactic Acid (PLA) filament and Acrylonitrile Butadiene Styrene (ABS) filament. This material is slightly flexible, durable, affordable, and lightweight, making it an excellent choice for 3D printing projects.

PETG is chemically stable, water-resistant, and provides greater product shelf life in outdoor applications. However, it can be more challenging to print than PLA or ABS. This article explores PETG material for 3D printing applications, covering material properties, available filament types, printer hardware requirements, and practical tips to avoid common PETG-related printing issues.

Material Properties of PETG Filament 3D Printed Parts

PETG is produced by introducing “glycol” modifications to PET, the common plastic used in water bottle manufacturing. While PETG retains the core properties of PET, the modification for 3D printing changes its recycling characteristics from recyclable PET to non-recyclable PETG.

Parts 3D printed with PETG filament deliver strong temperature resistance (thermal stability). They can withstand temperatures up to 85 °C. Beyond this point, printed parts begin to soften and lose dimensional accuracy.

Depending on the filament brand and printing conditions, PETG can achieve a material strength of 13 to 30 MPa. This allows PETG 3D printed parts to resist external pressure up to 30 MPa—sufficient for most domestic uses and some light industrial applications where plastic and 3D printing are the practical options.

PETG produces lightweight printed parts thanks to its low material density of just 1.2 g/cm³. A solid 1 cm³ calibration cube printed in PETG therefore weighs only 1.2 grams.

Advantages of PETG Filament

• PETG filament consistently delivers a glossy, smooth surface finish on final prints.
• Unlike ABS, PETG produces no unpleasant odors during printing, allowing use in enclosed spaces without special ventilation.
• The material’s natural stickiness provides excellent bed adhesion.
• Slow cooling characteristics result in minimal warping.

Disadvantages of PETG Filament

• The same stickiness that aids bed adhesion can also cause the filament to cling to the nozzle, leading to clogs.
• This property often results in stringing, where thin hair-like strands appear on the finished print.
• PETG exhibits poor bridging performance, which can limit certain design applications.

Applications of PETG Filament

Thanks to its chemical and water resistance combined with slight flexibility, PETG filament is widely used in outdoor applications involving fluids or requiring modest flexibility.

Common applications include:

• Decorative pieces
• Waterproof products
• Snap-fit assemblies
• Planter pots

Notable products 3D printed in PETG include:

• Self-watering planters
• Water bottles
• Snap-fit components

Types of PETG Filaments Available

Three main types of PETG filament are offered to consumer users:

• Standard PETG Filament
• PETG Pro Filament
• PETG CF Filament

Standard PETG filament is the most widely available option. It provides all the core benefits of PETG in a range of colors including green, brown, black, clear, and others. Filament diameter is 1.75 mm and spools are typically supplied in 1 kg quantities.

PETG Pro filament is an enhanced version engineered for extra strength, toughness, zero warping, and superior moisture resistance—ideal for demanding outdoor parts. Multiple color options are available.

PETG CF filament is a carbon-fiber-reinforced composite that delivers high strength, impact resistance, wear resistance, zero warping, and excellent moisture resistance. It is supplied only in black and is suited to light industrial uses.

Printer Hardware Requirements for PETG Filament

PETG is considered one of the more demanding 3D printing materials because of its glossy nature and strong adhesion to both nozzles and beds. Successful printing requires specific hardware settings.

Extruder/nozzle temperature should be set between 230 °C and 260 °C.

Bed temperature of up to 90 °C is essential to prevent warping; a heated bed is mandatory.

Part cooling fan operation at 100 % speed is recommended after the first layers to maintain dimensional accuracy.

Build surface quality matters greatly. A heated glass bed is highly recommended for optimal results with PETG.

Tips for PETG Filament 3D Printing

• Run a temperature tower test to determine the ideal nozzle temperature for your specific filament brand.
• If bed temperature cannot reach the recommended range, apply a glue stick or painter’s tape to improve adhesion.
• Keep the cooling fan off for the first one or two layers, then enable it at full speed.
• Use a raft when a glossy underside finish is desired.
• Calibrate retraction settings to minimize stringing.
• PETG is hygroscopic; store it in a dry environment or filament enclosure.

Conclusion on PETG Filament 3D Printing

PETG filament offers advantages over PLA and ABS through superior chemical stability, water and moisture resistance, higher strength, flexibility, and longer outdoor service life. Its glossy surface and minimal warping enable high-quality prints, although the material’s adhesive nature makes it slightly more challenging to print.

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