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PETG Filament 1.75mm

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PETG filament 1.75mm sits between PLA and ABS in the performance spectrum. It prints easier than ABS, is more temperature-resistant than PLA, and produces parts with good clarity and a clean surface finish. Siraya Tech's PETG range takes those base advantages and adds carbon fiber reinforcement and high-flow formulations for faster, stronger prints in demanding environments.

What Is PETG Filament

PETG (Polyethylene Terephthalate Glycol) is a thermoplastic that balances the printability of PLA with the durability of ABS. The glycol modification of standard PET gives it better impact resistance and makes it less prone to crystallization during printing, which is what causes stringing and clouding in unmodified PET.

PETG produces strong, slightly flexible parts with good chemical resistance and decent UV stability. It does not emit strong fumes the way ABS does, making it more pleasant to print indoors. The surface finish is naturally semi-gloss, which makes it look more finished than PLA straight off the build plate.

Easier to print than ABS, with better temperature and impact resistance than PLA
Good chemical resistance and decent UV stability for indoor and sheltered outdoor use
Low odor printing without the fumes associated with ABS
Natural semi-gloss surface finish looks clean without post-processing
Carbon fiber reinforced PETG adds stiffness and reduces thermal expansion for more demanding applications

PETG vs. ABS: Which Should You Choose

PETG and ABS each have strengths. PETG prints more easily, produces less odor, and handles moisture better than ABS. ABS offers higher HDT, better impact resistance at very low temperatures, and responds better to acetone smoothing. For most functional prototyping and end-use parts, PETG is the more practical choice. For parts that need extreme temperature resistance or will be finished with acetone, ABS still wins.

Siraya Tech PETG combines the practical printability of PETG with carbon fiber reinforcement and high-flow formulations. The result is a PETG that prints faster and performs better under load than standard PETG, without giving up the ease of use that makes PETG accessible.

Printability: PETG prints at lower temperatures than ABS and does not require an enclosure or aggressive bed adhesion. It adheres well to most surfaces and is less prone to warping than ABS.
Strength: Standard PETG is strong but somewhat flexible. Carbon fiber reinforced PETG like Siraya Tech's PETG-CF Pro adds stiffness and moves closer to ABS in structural load capacity.
Temperature resistance: PETG softens around 80C to 85C. Carbon fiber reinforced PETG pushes the HDT higher. For very high temperature environments above 100C, ABS or PPA is still the better choice.
Outdoor use: PETG has better UV resistance than ABS. Carbon fiber reinforced PETG extends that advantage further, making it suitable for outdoor functional parts that need to hold up over time.
Surface finish: PETG has a natural semi-gloss finish. Carbon fiber reinforced PETG produces a professional matte result, hiding layer lines better than standard PETG.

Siraya Tech PETG Filament 1.75mm Options

Carbon Fiber Reinforced

Fibreheart PETG-CF Pro HF

Chopped carbon fiber reinforced PETG with a high-flow formula. Prints up to 2X faster than standard PETG. HDT of 76C. Superior stiffness and dimensional stability. Professional matte finish with excellent layer adhesion and minimal warping.

Shop Fibreheart PETG-CF Pro HF

High Speed

Peopoly Lancer PETG-CF HF

10% carbon fiber reinforced PETG optimized for high-speed printing. Minimal warping, excellent first-layer adhesion, and chemical, UV, and moisture resistance. A strong choice for outdoor and industrial applications.

Shop Peopoly Lancer PETG-CF HF

What Makes Carbon Fiber PETG Different

Standard PETG handles most prototyping and functional printing well. Carbon fiber reinforced PETG takes the same polymer base and adds chopped carbon fiber to improve stiffness, reduce weight, and push the thermal and mechanical performance higher.

Stiffness: Carbon fiber reinforcement significantly increases flexural modulus compared to standard PETG. Parts that would flex under load with standard PETG hold their shape better with CF-PETG.
Dimensional stability: Carbon fiber reduces the coefficient of thermal expansion, meaning parts hold dimensions better as temperature changes. This matters for functional parts that need to fit precisely.
Weight: Carbon fiber reinforcement adds strength without the weight penalty of standard engineering plastics. Drone frames, brackets, and structural parts benefit from this.
Surface quality: Carbon fiber PETG produces a clean matte surface finish that hides layer lines better than standard PETG. Parts look more finished straight from the build plate.
Print speed: The high-flow formulations in Siraya Tech's carbon fiber PETG options are designed for faster printing without sacrificing layer bonding or surface quality.

How to Print PETG Successfully

Print at 230C to 260C. PETG prints at a higher temperature than PLA but lower than ABS. The high-flow formulations from Siraya Tech are optimized for the higher end of this range. Check the product datasheet for your specific filament.

Use a heated bed at 70C to 85C. PETG adheres well to a range of surfaces including PEI, glass with glue stick, and painter's tape. Too hot a bed can cause the print to adhere too firmly and damage the build surface on removal.

Keep part cooling fans low or off for the first few layers. PETG prints best with minimal cooling, especially on the first layers. Too much cooling causes poor layer bonding and warping.

Dry the filament before printing. While PETG is more moisture-resistant than ABS or nylon, it still absorbs some moisture. Wet PETG causes bubbling, poor surface finish, and stringing.

Use retraction settings appropriate for PETG. It is more prone to stringing than PLA but less so than some other materials. Moderate retraction speeds and temperatures in the 230C to 250C range typically give clean results.

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Frequently Asked Questions

What is PETG filament best used for?

PETG is one of the most versatile FDM filaments. It works well for functional prototypes, end-use parts, mechanical components, enclosures, and decorative prints. Its good chemical resistance and low odor make it suitable for indoor printing. Carbon fiber reinforced PETG like Siraya Tech's PETG-CF Pro extends those use cases into structural parts, drone components, and outdoor functional applications where standard PETG would be pushed to its limits.

Does PETG need a heated bed?

Yes, a heated bed improves PETG print quality significantly. PETG prints best on a bed at 70C to 85C. Below this range, the first layer may not adhere well enough to build a solid base. Above this range, the print can adhere too strongly and damage the build surface on removal. A smooth PEI sheet or glass with a thin glue stick layer typically works well for PETG.

What is the HDT of carbon fiber PETG?

Siraya Tech Fibreheart PETG-CF Pro has an HDT of 76C, which is notably higher than standard PETG. This makes it suitable for parts that will be used in warmer environments or in direct sunlight where standard PETG would soften. The carbon fiber reinforcement also raises the effective service temperature compared to standard PETG.

Can PETG be used outdoors?

Yes. PETG has better UV resistance than ABS and does not degrade as quickly in sunlight. Carbon fiber reinforced PETG extends this advantage further, making it one of the better choices for functional outdoor parts from an FDM printer. For long-term outdoor use in harsh conditions, PPA or other high-performance filaments offer better durability, but for sheltered outdoor use or seasonal outdoor parts, carbon fiber PETG holds up well.

Is carbon fiber PETG abrasive to print with?

Carbon fiber PETG contains chopped carbon fibers that are more abrasive than standard polymers. While it is less abrasive than glass fiber reinforced filaments, extended use with a standard brass nozzle will cause some additional wear. For regular printing of carbon fiber PETG, a hardened steel or tungsten carbide nozzle is recommended to maintain consistent extrusion diameter over time.

What is the difference between PETG and PETG-CF?

PETG-CF is carbon fiber reinforced PETG. The base polymer is the same, but the addition of chopped carbon fiber improves flexural modulus, reduces thermal expansion, lowers weight, and raises the HDT. Standard PETG is more flexible and has lower temperature resistance. PETG-CF prints at similar temperatures but may require slightly higher flow rates to compensate for the fiber content, and benefits from a hardened nozzle due to the abrasive carbon fiber.

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