PETG Filament

PETG (PET, PETT) Filaments

Products printed with PETG yarn

petg filaments

What is PETG Filament?

A lot of people don’t know what are PETG, PET, PETT Filaments but surely see water plastic bottles. Polyethylene terephthalate (PET) is the most commonly used plastic in the world. Best known as the polymer used in water bottles, it is also found in clothing fibers and food containers. Although “raw” PET is rarely used in 3D printing, its variant PETG is becoming an increasingly popular filament for 3D printers.

More info about PETG (PET, PETT) Filaments

The “G” in the PETG acronym stands for “glycol-modified,” and the result is a filament that is cleaner, less fragile and, most importantly, easier to print than its original form. For this reason, PETG is often considered a good middle ground between ABS and PLA, the two most commonly used filament types for 3D printers, because it is more flexible and durable than PLA and easier to print than ABS. Read more about this filament on wiki

When using PETG, 3D printer enthusiasts should consider three features:

PETG is hygroscopic, which means that it absorbs moisture from the air. Since this has a negative effect on the material, store your 3D printer filament in a cool, dry place.

PETG is sticky during printing, which makes this 3D printer filament a poor choice for support, but it is better for layer adhesion. Just be careful with the print table.

PETG scratches more easily than ABS.

Polyethylene trimethylene terephthalate (PETT) is another PET option. This 3D printer filament, slightly stiffer than PETG, is popular because of its transparency.


“PETG is often considered a good middle ground between ABS and PLA, the two most

commonly used filament types for 3D printers.”

3D Printer Filament Properties: PETG (PET, PETT)

  • Strength: High | Flexibility: Medium | Durability: High;
  • the difficulty of use: low;
  • printing temperature: 220 ° C – 250 ° C;
  • table temperature: 50 ° C – 75 ° C;
  • shrinkage/strain: minimal;
  • soluble: none;
  • food safety: refer to the manufacturer’s manual.

When should these filaments be used?

PETG is a versatile material, but it differs from many other types of filament for 3D printers in its flexibility, strength, and resistance to both heat and impact. This makes it an ideal 3D printer filament for use with functional items that may experience constant or sudden stresses, such as mechanical parts, printer parts, and protective components.

Summary of PETG (PET, PETT) 3D printer filament

Pros: flexibility, durability, ease of printing.

Cons: susceptible to moisture, the surface is easily scratched.


Is PETG Filament Food Safe

Ensuring the safety of 3D printed objects for food-related purposes is a significant concern, especially when it comes to PETG filament. PETG filament is commonly used in 3D printing, but its food safety remains a subject of inquiry.

While many PETG filaments claim to be food safe or compliant with FDA regulations for food contact, it is essential to exercise caution. It is recommended to verify the specific filament’s food safety certification or compliance before using it for food-related applications.

It is crucial to note that even if the filament itself is deemed food safe, the 3D printing process introduces potential risks. The printing process may result in imperfections or micro-gaps that can harbor bacteria or other contaminants. Consequently, direct contact between 3D printed PETG objects and food or beverages is generally discouraged.

Despite these limitations, there are still practical applications for PETG filament in the culinary realm. For instance, using PETG to create kitchen utensils, molds, or decorative pieces that do not directly interact with food can be a viable option.

Maintaining proper hygiene is key when using 3D printed objects with PETG filament. Thoroughly cleaning and sanitizing the objects before use is imperative. Regular inspections for signs of wear or degradation are also necessary, and if any issues arise, it is advisable to discontinue their use for food-related purposes.

In conclusion, while PETG filament may possess inherent food safety properties, exercising caution and adhering to proper hygiene practices are essential when using 3D printed objects in food-related contexts. Prioritizing safety and being mindful of the limitations associated with PETG filament will ensure a responsible approach to incorporating 3D printing into culinary pursuits.


Is PETG Filament Toxic?

Considering the potential toxicity of PETG filament in 3D printing is a valid concern. Through my extensive exploration of this subject, I can offer insights on the matter.

PETG filament, as commonly used in 3D printing, is generally regarded as non-toxic. It is formulated to be safe for various applications, including 3D printing. PETG, short for Polyethylene Terephthalate Glycol-Modified, does not contain harmful chemicals like BPA or phthalates.

However, it is important to note that during the 3D printing process, certain filaments, including PETG, can emit volatile organic compounds (VOCs) and ultrafine particles. These emissions occur due to the heating and melting of the filament material. Although the levels of VOCs and particles are typically low, it is advisable to operate your 3D printer in a well-ventilated area to minimize potential exposure.

If you have concerns about the potential toxicity of PETG filament or any other 3D printing material, I recommend referring to the manufacturer’s safety data sheets (SDS). These documents provide comprehensive information regarding composition, handling, and potential hazards associated with the filament.

To further mitigate potential risks, it is essential to adhere to proper safety guidelines when handling and operating your 3D printer. This includes maintaining a clean workspace, utilizing appropriate personal protective equipment (PPE), and ensuring adequate ventilation.

If you have specific health concerns or sensitivities, consulting with a medical professional or seeking expert advice regarding the use of 3D printing materials is always recommended.

In conclusion, while PETG filament itself is generally considered non-toxic, it is essential to be mindful of possible emissions during the printing process. By implementing necessary precautions, operating in well-ventilated environments, and following proper safety practices, you can minimize potential risks and confidently explore the creative possibilities presented by PETG filament in your 3D printing endeavors.


Is petg filament flexible?

Yes, PETG filament is known for its flexibility. Compared to other popular 3D printing filaments like PLA, PETG offers a higher degree of flexibility and impact resistance. It has a certain level of elasticity, allowing it to bend and deform to a certain extent without breaking. This flexibility makes PETG filament a preferred choice for applications that require durability and toughness, such as functional parts, mechanical components, and even certain types of prosthetics. The flexibility of PETG filament can vary depending on the specific brand and formulation, so it’s always a good idea to test and experiment with different settings to achieve the desired level of flexibility in your prints.

Reasons Why Use PETG filament

There are several reasons why PETG filament is a popular choice in the world of 3D printing. Let me share with you some of the key advantages and benefits of using PETG filament:

  1. Strength and Durability: PETG filament offers excellent strength and durability, making it suitable for producing functional parts and objects that need to withstand various stresses and impacts. It has a higher impact resistance compared to filaments like PLA, making it less prone to breaking or cracking.
  2. Flexibility and Elasticity: PETG filament exhibits a certain level of flexibility and elasticity, allowing it to bend and deform without snapping. This makes it ideal for applications that require some degree of flexibility, such as hinges, snap-fit parts, or prototypes that need to be tested for functionality.
  3. Chemical Resistance: PETG filament is resistant to many chemicals, including common household chemicals and cleaning agents. This property makes it suitable for printing objects that may come into contact with liquids, such as containers or water-tight enclosures.
  4. Ease of Printing: PETG filament is known for its ease of printing compared to more advanced filaments like ABS. It has a lower tendency to warp during printing, and it adheres well to the print bed. This makes it easier for beginners and experienced users alike to achieve successful prints with PETG filament.
  5. Transparency and Clarity: PETG filament has excellent transparency, allowing for the creation of clear and visually appealing prints. This property is particularly useful for applications such as light diffusers, display cases, or artistic pieces that require a transparent or translucent finish.
  6. Food Safety: Certain PETG filaments are labeled as food safe or comply with FDA regulations for food contact. These filaments are specifically formulated with food-grade materials and additives, making them suitable for printing objects that come into contact with food or beverages.

These advantages make PETG filament a versatile choice for a wide range of 3D printing applications, including functional prototypes, mechanical parts, artistic creations, and even objects for everyday use. Whether you’re a hobbyist, professional, or industrial user, PETG filament offers a balance of strength, flexibility, and ease of use to bring your ideas to life.

UV Resistance

PETG filament does offer some level of UV resistance, but its exact resistance can vary depending on the specific brand and formulation of the filament. Generally, PETG has better UV resistance compared to PLA filament but may not be as resistant as other filaments like ABS or Nylon.

Exposure to ultraviolet (UV) radiation can cause degradation and discoloration in many materials, including 3D printed objects. Over time, prolonged exposure to sunlight or UV radiation can lead to fading or yellowing of the PETG printed parts.

To improve the UV resistance of PETG prints, there are a few steps you can take. Applying a post-processing treatment like a UV-resistant coating or clear sealant can help protect the printed objects from UV damage. Additionally, using PETG filaments with added UV stabilizers or additives can enhance their resistance to UV radiation.

It’s important to note that even with UV-resistant measures in place, long-term exposure to intense UV radiation may still cause some degree of degradation. Therefore, if you plan to use PETG prints in outdoor environments or under prolonged UV exposure, it’s advisable to consider additional protective measures or explore alternative filament options that offer higher UV resistance, such as UV-resistant ABS or specialty UV-resistant filaments.

Overall, while PETG filament does offer some inherent UV resistance, it’s important to consider the specific requirements of your application and take appropriate steps to minimize the potential effects of UV radiation on your prints.

Is it Hygroscopic and Waterproof

PETG filament is hygroscopic, meaning it has a tendency to absorb moisture from the surrounding environment. This moisture absorption can impact the quality of the filament and the resulting prints. When exposed to moisture, PETG filament may become brittle, produce inconsistent prints, or experience issues like popping and bubbling during the printing process.

To mitigate the effects of moisture absorption, it’s important to store PETG filament properly. This typically involves keeping it in a sealed container or airtight bag with desiccant to minimize exposure to moisture. Additionally, drying the filament before printing, either using a filament dryer or by placing it in a low-temperature oven for a specified period, can help remove any absorbed moisture and restore its printing properties.

Regarding waterproofing, PETG itself is water-resistant to some extent. It does not easily absorb water or dissolve in it like some other filaments such as PLA. However, it’s important to note that 3D prints made with PETG filament are not inherently waterproof. The printed objects may have microscopic gaps or layer lines where water can potentially seep in. Therefore, if water resistance or waterproofing is a specific requirement for your project, additional post-processing steps like sealing or coating the prints with a water-resistant material may be necessary.

In summary, PETG filament is hygroscopic and can absorb moisture from the environment, which can affect print quality. Proper storage and drying procedures are important to minimize the impact of moisture absorption. While PETG itself is water-resistant, 3D prints made with PETG may not be inherently waterproof and may require additional steps to achieve the desired level of water resistance.

What is the Difference Between PLA and PETG Filament

Please note that these differences may vary depending on the specific brand and formulation of the filament. It’s always a good practice to refer to the manufacturer’s guidelines and recommendations for each filament type.


PLA Filament PETG Filament
Material Polylactic Acid (PLA) Polyethylene Terephthalate Glycol-Modified (PETG)
Strength Relatively rigid, less flexible More flexible and impact-resistant
Durability More brittle, prone to cracking under stress Tougher and less prone to breaking
Printing Temperature Lower printing temperature (180-220°C) Higher printing temperature (220-250°C)
Warping More prone to warping during printing Less prone to warping during printing
Heat Resistance Lower heat resistance, may deform at higher temperatures Higher heat resistance, less likely to deform at higher temperatures
Moisture Absorption Minimal moisture absorption Hygroscopic, absorbs moisture from the environment
UV Resistance More susceptible to UV degradation and discoloration Better UV resistance, but may still experience some degradation
Printing Ease Easy to print, suitable for beginners Moderately easy to print, requires some adjustments
Biodegradability Biodegradable and derived from renewable resources Non-biodegradable, derived from petroleum-based sources
Applications Ideal for detailed models, prototypes, and decorative items Suitable for functional parts, mechanical components, and outdoor applications

Please note that these differences may vary depending on the specific brand and formulation of the filament. It’s always a good practice to refer to the manufacturer’s guidelines and recommendations for each filament type.

What Temperature to Dry PETG Filament

The recommended temperature for drying PETG filament typically ranges from 60°C to 70°C (140°F to 158°F). Drying the filament at this temperature helps remove any moisture that may have been absorbed, ensuring optimal print quality and preventing issues like bubbling or popping during printing.

It’s important to note that different brands and formulations of PETG filament may have specific drying guidelines, so it’s always best to refer to the manufacturer’s recommendations. Some filament manufacturers may provide specific temperature and time guidelines for drying PETG filament.

To dry PETG filament, you can use a dedicated filament dryer or an oven with precise temperature control. Place the filament in the drying chamber or on a drying rack, making sure it is evenly spread out for effective drying. Set the temperature within the recommended range and allow the filament to dry for the recommended duration, typically a few hours.

Remember to monitor the filament closely during the drying process to prevent overheating or melting. Once the drying process is complete, store the filament in a sealed container with desiccant to minimize moisture absorption before use.

By properly drying PETG filament, you can help maintain its printing properties and achieve better results in your 3D prints.