PETG-CF 3D printing — carbon fibre reinforced for jigs and fixtures

Considering standard PETG instead of PETG-CF? Read our guide to PETG 3D printing — when the unreinforced material is the right choice.

PETG-CF is the material that combines PETG's printability and chemical resistance with the stiffness of carbon fiber — and the result is a technical FDM filament that solves a whole category of industrial tasks that standard PETG simply isn't strong enough for. At Maker Factory we print PETG-CF for jigs, fixtures, welding templates and structural components that require high stiffness and dimensional stability.

On this page we cover when PETG-CF is the right choice, what technical properties the material has, and what it costs to have PETG-CF printed with us.

Read more about our standard PETG material, our PETG-CF material page with technical datasheet, or our broad 3D printing service for businesses and individuals.

What is PETG-CF?

PETG-CF — carbon-fiber-reinforced PETG (polyethylene terephthalate glycol) — is a composite type where short carbon fiber particles are mixed into the PETG matrix. The carbon fiber acts as reinforcement: it significantly increases the material's stiffness and tensile strength, while the PETG base contributes chemical resistance, low shrinkage and good layer adhesion.

Compared to pure PETG, PETG-CF is typically 40–60% stiffer and has noticeably better dimensional stability — meaning parts in PETG-CF hold their shape and dimensions better under mechanical load and temperature fluctuations. This makes the material well suited for production tooling, assembly jigs and other parts used in repeated workflows that need stable tolerances over time.

An important practical point: PETG-CF can be printed on standard FDM printers with a hardened-steel nozzle — it requires neither a heated print chamber nor special configuration, unlike PA6-CF. That means shorter setup time and lower cost per part, making PETG-CF the preferred choice when PA6-CF's extreme properties aren't needed.

When to choose PETG-CF over other materials?

PETG-CF isn't the right choice for every task — but it's the obvious choice in specific scenarios where pure PETG is too soft, PA6-CF is overspecified, and PLA is too brittle. Here are the three primary use cases:

Precision jigs and welding fixtures for batch production

A welding fixture needs to hold parts in exact position, time after time, under heat and mechanical load. Traditionally these are made from steel or aluminum — but for many geometries and production volumes, PETG-CF 3D printing is a faster and cheaper alternative that provides sufficient stiffness and dimensional stability.

PETG-CF's high modulus of elasticity (stiffness) means fixtures hold their shape and dimensions even under repeated use. The material withstands brief exposure to heat from adjacent welding operations and isn't hygroscopic to the same degree as PA6-CF — it absorbs very little moisture and doesn't change dimensions over time. We've delivered PETG-CF welding fixtures to machine-building companies, replacing aluminum fixtures with 2–4 weeks lead time with 3D-printed alternatives ready in 3 business days.

Assembly tooling and process jigs for industrial lines

Production lines need a wide range of specialized tools and aids: depth stops, positioning plates, assembly guides and inspection gauges. These require high precision and good wear resistance, but rarely need the full strength of metal. PETG-CF hits this middle ground precisely.

The advantage of 3D printing in PETG-CF is that specialized tooling can be designed and produced in days instead of weeks. If a jig wears down or the design needs to change, turnaround time is minimal — there are no molds to edit, no minimum order quantities to place. We often see production companies use PETG-CF as a step from prototype jigs to actual production tooling, because the material withstands thousands of cycles under normal working loads.

Structural components requiring low weight and high stiffness

In applications where weight is a factor — drone frames, robot arms, load-bearing structures in machines — PETG-CF offers a favorable strength-to-weight ratio compared to metal. Density is approximately 1.24 g/cm³, far below aluminum (2.7 g/cm³) and steel (7.8 g/cm³), while stiffness is significantly higher than standard plastic.

For components that aren't exposed to temperatures above 75–80°C, and that don't require PA6-CF's extreme tensile strength, PETG-CF is a more printable and cost-effective choice. Complex geometries that would require expensive CNC machining in metal can be printed in PETG-CF with the same day-to-day flexibility as standard FDM printing.

Technical specifications for PETG-CF

Comparison: PETG-CF vs. PETG, PA6-CF and PLA

Typical tasks we solve with PETG-CF 3D printing

PETG-CF is used across a broad range of industrial and technical applications where precision and stiffness are critical. The most common task types we solve:

• Welding fixtures and positioning jigs for machine building and automation — holds parts in exact position during production
• Control gauges and inspection tools for quality assurance — verifies dimensions and tolerances on ongoing production
• Assembly guides and depth stops for assembly-line production — reduces mis-assembly and increases efficiency
• Structural brackets and load-bearing profile segments for industrial applications with low-to-medium load
• Drone frames and robot components requiring a low strength-to-weight ratio
• Cable ducts and EMI shielding frames for electronics and technology
• Replacement parts for machines with short lead times — from CAD file to delivery in 2–3 business days

What does PETG-CF 3D printing cost at Maker Factory?

The price of PETG-CF printing depends on the part's geometry, volume and the required infill density. PETG-CF is slightly more expensive than standard PETG as a filament, and requires a hardened nozzle — but is significantly cheaper to produce than PA6-CF, which requires a heated print chamber and more specific machine setup.

• Smaller jigs and fixtures (under 100 cm³) — typically DKK 200–500 per piece
• Medium-sized parts (100–400 cm³) — typically DKK 400–1,200 per piece
• Series (5+ pieces) — volume discount — contact us for a series quote

We always tailor infill percentage, wall thickness and print orientation to the specific load direction for your part. An incorrect print orientation can halve the effective strength — we design with this in mind from the start.

FAQ about PETG-CF 3D printing

What's the difference between PETG-CF and standard PETG?

PETG-CF contains short carbon fiber particles that increase the material's stiffness and tensile strength by 40–60% compared to pure PETG. The base is the same polymer type, so chemical resistance and low hygroscopicity are retained. PETG-CF is, however, somewhat more brittle than PETG under extreme bending — it's a stiffer, not a tougher, material.

Does PETG-CF need a heated print chamber?

No — that's one of PETG-CF's key practical advantages over PA6-CF. PETG-CF can be printed on standard FDM printers with a hardened-steel nozzle (necessary due to the abrasiveness of carbon fiber). That means lower production cost and shorter lead time than PA6-CF, which requires an enclosed, heated print chamber.

Can PETG-CF be used for welding fixtures?

Yes, in many cases. PETG-CF withstands brief heat exposure from adjacent welding operations and has sufficient stiffness to hold parts in exact position. It isn't suited, however, for direct contact with welding heat or for applications continuously exposed to temperatures above 80°C. For those purposes we recommend PA6-CF or a metal-based alternative.

What is PETG-CF's chemical resistance like?

PETG-CF inherits the good chemical resistance of the PETG base: the material resists oil, grease, alcohol and weak acids well. It isn't resistant to strong oxidizing acids, ketones (e.g. acetone) or chlorinated solvents. For most industrial production environments, the chemical resistance is sufficient.

Can PETG-CF be printed in complex geometries?

Yes. PETG-CF is printed as standard FDM with support structures that are removed after printing. Complex internal channels, undercuts and fine details are possible, though with the usual FDM limitations for overhangs. We're happy to advise on design optimization if you send us your STL file.

Can PETG-CF be replaced with standard PETG to save money?

It depends on the task. For decorative or lightly loaded parts, standard PETG is a cheaper and fully adequate alternative. For jigs, fixtures and structural components requiring stiffness and dimensional stability, PETG-CF is clearly the better choice — and the price difference is typically 20–40% per part, which is quickly recouped through fewer mis-assemblies or re-inspections.

Which print orientation is best for PETG-CF parts?

Print orientation has a major impact on a part's effective strength. The carbon fiber is oriented along the print direction (the X/Y plane), giving high strength in those directions but lower strength in the Z direction (layer-to-layer). We always plan the print orientation so the primary load vectors in your application are parallel to the X/Y plane. Send us your load requirements with your inquiry so we can optimize the setup.