PETG is a popular 3D printing filament known for combining the ease of printing seen in PLA with the durability and strength of ABS. It is a glycol-modified version of PET, which makes it more flexible and less prone to brittleness. PETG offers excellent chemical resistance, making it suitable for various functional applications.

Common Uses:

• Functional parts
• Mechanical components
• Consumer products
• Outdoor applications
• Containers and bottles

PETG Variations:

PETG+

PETG+ is an improved version of standard PETG, typically offering better impact resistance and printability.

It’s great for parts that require more toughness, especially in functional or load-bearing applications.

PETG CF (Carbon Fibre)

This variation incorporates carbon fibres, making the filament significantly stiffer and stronger, with a higher strength-to-weight ratio.

It’s ideal for structural parts or components that need to be lightweight yet strong.

PETG Matte

PETG Matte produces a more subdued, matte finish, reducing the glossy appearance that’s typical of regular PETG.

This material is perfect for applications where aesthetics matter, and a less shiny finish is desired.

Transparent PETG

PETG in a transparent formulation offers excellent clarity and optical properties, making it ideal for parts requiring transparency.

It can be used in cases, containers, or any print requiring see-through characteristics.

PETG Variations Comparison Table

Material	Strength	Flexibility	Heat Resistance	Surface Finish	Common Applications
PETG	High	Moderate	Medium (~80°C)	Glossy	Functional Parts, Containers
PETG+	Very High	Moderate	Medium (~80°C)	Glossy	Load-bearing Parts, Mechanical Components
PETG CF	Very High	Low	Medium (~80°C)	Slightly Matte	Lightweight Structural Parts
PETG Matte	High	Moderate	Medium (~80°C)	Matte	Aesthetic Parts, Functional Components
Transparent PETG	High	Moderate	Medium (~80°C)	Glossy/ Transparent	Containers, Light Fixtures

 

Pros and Cons of PETG

Like all filaments, there are pros and cons to using PETG and its variations.

Pros:

• Durable and impact-resistant: PETG is tougher and more flexible than PLA, making it ideal for functional parts.
• Chemical resistance: It holds up well against a variety of chemicals, including water, solvents, and acids.
• UV-resistant: PETG is more resistant to UV exposure than PLA, making it suitable for outdoor use.
• Easy to print: Similar to PLA, PETG is relatively easy to print with minimal warping and good adhesion to the print bed.
• Less brittle than PLA: PETG offers a good balance of flexibility and strength, making it less prone to cracking.

Cons:

• Stringing issues: PETG tends to string more than PLA due to its viscosity, requiring optimised retraction settings.
• Lower detail resolution: PETG doesn’t always capture fine details as sharply as PLA, particularly on smaller prints.
• Less rigid than ABS: While durable, PETG is still less stiff compared to ABS or Nylon.
• Bed adhesion issues: If not properly set, PETG can adhere too strongly to certain bed surfaces, sometimes damaging them.

Storage Tips:

PETG, like PLA, is hygroscopic. This means it absorbs moisture from the air, which can negatively impact print quality. Here are some tips to store it properly:

• Store in an airtight container with desiccant packs to keep moisture out.
• Use a filament dryer if you’re printing in a humid environment or after long storage periods.
• Dry before printing if the filament has absorbed moisture (using a filament dryer or low-temperature oven at around 60°C for a few hours).

Environmental Considerations:

PETG is a recyclable plastic, though it may not be accepted in regular home recycling programs. Some key considerations:

• Recyclable but not biodegradable: Unlike PLA, PETG is not biodegradable. However, it can be recycled in appropriate facilities.
• Long-lasting: PETG is more durable and resistant to environmental factors than PLA, making it a better option for long-term or outdoor applications.
• Chemical resistance: Its resistance to chemicals makes PETG a less eco-friendly option compared to PLA, though it can last longer in use.

Generic Print Settings for PETG:

Extruder Temperature: 220°C – 250°C

Bed Temperature: 70°C – 90°C

Print Speed: 30 – 60 mm/s (slower speeds help with better adhesion and detail)

Bed Adhesion: Blue tape, glue stick, or PEI sheets work well, but PETG can stick too firmly to glass or PEI without a separating layer like glue stick

Cooling: Partial cooling fan use; full cooling may weaken layer adhesion

Retraction: 3 – 6 mm at 30 – 45 mm/s to reduce stringing

Print settings can vary between filaments. Always check the manufacturer’s recommended settings on the spool’s packaging or the supplier’s website before starting your print.

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