3RDAX™ PETG-CF12 Carbon Fiber 1.75mm

ABOUT THIS FILAMENT
PETG-CF12 takes the easy printing behaviour and strong layer adhesion of standard PETG and reinforces it with 12% Carbon Fiber to improve stiffness, reduce flex, and increase dimensional stability. It keeps the low warp characteristics and durability that make PETG such a practical functional material, while delivering a stronger, more rigid structural feel.

This remains one of the strongest and most capable filaments in the range for functional printing, and has been the go to choice for many structural parts, brackets, mounts, and workshop components where standard PETG simply is not enough. Layer adhesion remains excellent, strength remains high, and the finished parts still perform exactly where it matters.

This current batch does differ slightly from previous runs. The filament itself is a little more brittle in spool form, and the finished surface tends to have a slightly rougher, more textured feel rather than the smoother finish earlier batches were known for. Print performance and strength remain strong, but because of that batch variation it is being offered at a sharper price while the original formulation is being produced again.

That makes it a good opportunity to pick up a high performance Carbon Fiber PETG at reduced cost, especially if function matters more than a perfect cosmetic finish.

WHERE IT WORKS BEST
PETG-CF12 works best for functional parts where rigidity, dimensional stability, and reduced flex matter more than flexibility or impact absorption. It is well suited to brackets, mounts, jigs, fixtures, tool holders, housings, and machine parts where standard PETG may still feel too soft.

It is particularly useful for workshop parts, structural brackets, automotive mounts, housings, and functional components where strength and stiffness are more important than surface appearance.

For many users, PETG-CF12 offers a strong step up from standard PETG while staying easier to print than higher demand engineering materials like ABS, ASA, or Polycarbonate.

WHERE IT COMES FROM
PETG-CF12 starts with PETG, a glycol modified polyester derived from petroleum based raw materials. These are refined into chemical building blocks and processed into a thermoplastic designed for strong layer adhesion, low shrinkage, and good chemical resistance.

The glycol modification separates PETG from standard PET, reducing brittleness and improving printability by making the material easier to process and less prone to crystallisation.

That base material is then reinforced with 12% chopped Carbon Fiber, increasing stiffness, reducing flex, and improving dimensional stability. This Carbon Fiber reinforcement is what gives the material its stronger structural feel and improved rigidity over standard PETG, while also contributing to the rougher surface finish and slightly more brittle filament behaviour in this current batch.

PRINTING WITH IT
PETG-CF12 prints similarly to standard PETG, but the added Carbon Fiber changes flow behaviour and makes the filament more abrasive. A hardened steel nozzle is essential. Standard brass nozzles are not recommended.

This current batch uses a slightly coarser Carbon Fiber blend than previous runs, which can produce a rougher surface finish and may require a little more attention to nozzle cleanliness during longer prints. In some setups, larger nozzle sizes or occasional cold pulls can help maintain more consistent extrusion and reduce the chance of partial blockages.

It does not require an enclosure and remains far easier to print than many engineering materials, but slightly slower print speeds and good temperature control will usually produce the best results.

Like standard PETG, moisture can affect print quality, so drying before use is recommended for the best surface finish, layer adhesion, and extrusion consistency.

MATERIAL COMPATIBILITY
PETG-CF12 performs best as a single material print and bonds reliably to itself when printed correctly.

For support materials, PETG itself can often be used effectively depending on the part and setup, though support tuning may need adjustment due to the stiffer reinforced structure.

Like standard PETG, it does not naturally bond well to PLA, which can sometimes be useful in multi material setups where easier support separation is preferred.

BASE, CARBON OR GLASS?
Standard PETG remains the better all round option when impact resistance, flexibility, and ease of printing are the priority. It is more forgiving, less abrasive, and often the better choice for general purpose parts that may need to flex or absorb repeated knocks.

Within the reinforced PETG range, PETG-CF12 is the more balanced option. It improves stiffness