eSUN PET-CF Filament

eSUN PET-CF is an engineering PET-based filament reinforced with carbon fiber for FDM/FFF 3D printing of rigid, strong and heat-resistant parts. The material is designed for applications where standard PETG, PLA or decorative filaments no longer provide enough rigidity, heat resistance or long-term load stability.

PET-CF offers high rigidity, good dimensional stability, low moisture absorption, improved wear resistance and a matte technical surface. Short-cut carbon fiber reinforcement helps strengthen the PET base, reduce deformation during printing and produce a more professional look on finished parts.

The material is suitable for technical housings, brackets, holders, industrial fixtures, automotive components, aerospace prototypes, tool fixtures, jigs, functional parts, equipment components and models that require rigidity, load resistance, clean carbon-fiber texture and improved heat resistance.

What is eSUN PET-CF

PET-CF is a PET filament reinforced with carbon fiber. Unlike PETG-CF, which is based on PETG and usually has an easier temperature profile, PET-CF belongs to a more engineering-oriented material group. It prints at a higher nozzle temperature, requires drying before printing and is intended for technical parts where rigidity, stability and temperature resistance are important.

Compared with standard PETG, PET-CF is more rigid and less glossy. Compared with PLA-CF, it is more suitable for functional parts that must withstand more demanding operating conditions. Compared with PA-CF, PET-CF can be more practical to print because it does not officially require an enclosed heated chamber, although a dry box and stable printing temperature always improve results.

✅ Key advantages of eSUN PET-CF

• Carbon fiber reinforcement: improves rigidity, hardness and material stability.
• High rigidity: suitable for brackets, housings, holders, mounting parts and technical components.
• Improved heat resistance: after proper annealing, the material’s heat resistance can increase significantly.
• High stability: suitable for functional parts with shape and dimensional requirements.
• Low moisture absorption: PET-CF is more moisture-resistant than many engineering materials, but it still needs drying before printing.
• Wear resistance: useful for parts working in mounts, fixtures and technical assemblies.
• Chemical resistance: suitable for applications where resistance to certain chemical environments matters.
• Reduced deformation during printing: carbon fiber helps reduce PET warping behavior.
• Matte carbon-fiber surface: printed parts look technical, clean and professional.
• Black engineering color: universal for industrial, automotive and functional parts.

Color and appearance

eSUN PET-CF is available in black. This is the classic technical shade for carbon-fiber-reinforced engineering plastics. Printed parts have a matte carbon-fiber surface where layer lines and small visual defects are less noticeable compared with glossy materials.

📐 Technical specifications

📊 Physical and mechanical properties

Heat resistance and annealing

One of the key advantages of PET-CF is its improved heat resistance. The base heat deflection temperature is 75 ℃ at 0.45 MPa, while after proper annealing the value can reach 145 ℃ at 0.45 MPa. This makes the material useful for parts that need to keep their shape at higher temperatures than standard PETG or PLA.

Annealing should be performed carefully because heat treatment can affect part geometry. For accurate parts, it is recommended to test annealing on a small model first, check shrinkage and dimensional changes, and only then apply the selected process to working parts.

Chemical resistance

According to the technical data sheet, PET-CF demonstrates resistance to several chemical influences, including organic acids, non-polar solvents, many solvents, light aging and water environment below 60 ℃. These properties make the material useful for technical components, housings, fixtures and parts that may work in more demanding conditions than ordinary decorative plastics.

Chemical resistance depends on substance concentration, temperature, contact time, layer orientation, infill and print quality. For critical applications, testing the real printed part in the real operating environment is recommended.

⚙️ Recommended Printing Parameters

eSUN PET-CF printing recommendations

• Dry the filament at 80 ℃ for more than 8 hours before printing.
• For long print jobs, use a dry box or sealed filament container.
• Use a wear-resistant nozzle: hardened steel, ruby, tungsten carbide or another wear-resistant nozzle.
• Do not use a standard brass nozzle for regular printing: carbon fiber accelerates nozzle wear.
• Start printing at 40–80 mm/s, especially for functional and accurate parts.
• For maximum rigidity, use enough walls and an appropriate infill pattern.
• Reduce outer wall speed when a cleaner matte surface is required.
• Use Z seam alignment and choose the seam position for a cleaner appearance.
• Disable Z-hop / Z-lift if it leaves marks on the surface.
• Avoid travel moves across outer walls.
• After printing, let the part cool on the bed to reduce deformation risk.
• For higher heat resistance, test annealing and check dimensional changes.

Best applications for eSUN PET-CF

• ⚙️ Functional engineering parts.
• 🔩 Brackets, fixtures, holders, mounts and installation elements.
• 🏭 Industrial jigs, fixtures and tool fixtures.
• 🚗 Automotive parts, prototypes and technical inserts.
• ✈️ Aerospace prototypes and lightweight rigid components.
• 🧩 Parts for 3D printers, machines and equipment.
• 📦 Electronic housings, covers, panels and protective elements.
• 🧪 Functional prototypes for checking shape, fit, rigidity and heat resistance.
• 🛠️ Working parts where standard PETG is not rigid enough or not heat-resistant enough.
• ⚫ Black technical parts with a matte carbon-fiber surface.

PET-CF vs PETG-CF vs PLA-CF vs PA-CF

3D printer compatibility

eSUN PET-CF is compatible with FDM/FFF 3D printers using 1.75 mm filament, supporting a 250–300 ℃ nozzle temperature range and a 70–120 ℃ heated bed. Stable printing also requires dry material, a wear-resistant nozzle and a properly tuned profile.

The material can be printed on Bambu Lab, Creality, Prusa, Anycubic, Elegoo, QIDI, Flashforge, Raise3D, Voron and other FDM/FFF printers if the printer supports the required hotend temperature and stable feeding of composite filament. For hotends with PTFE tubing, check the allowed temperature carefully: for long PET-CF printing, an all-metal hotend is recommended.

Why a wear-resistant nozzle is needed

PET-CF contains carbon fiber, so the material is abrasive. When printing with a standard brass nozzle, the nozzle opening can wear quickly, causing reduced accuracy, unstable extrusion, changed line width and lower surface quality.

For PET-CF, hardened steel, ruby, tungsten carbide or another wear-resistant nozzle is recommended. A 0.4 mm nozzle is suitable for most tasks, but for long print jobs, more stable feeding and stronger parts, a 0.6 mm nozzle is often more convenient.

Drying and storage

PET-CF must be printed dry. Wet material can cause bubbles, popping, unstable extrusion, rough surface and reduced part strength. Before printing, drying the spool at 80 ℃ for more than 8 hours or 80–100 ℃ for 4–8 hours is recommended.

• Store the spool in a sealed bag or container with desiccant.
• Use a dry box for long print jobs.
• Do not leave the filament open in a humid room.
• If bubbles, popping or rough matte surface appear, dry the material again.
• After printing, return the spool to dry storage immediately.
• For short-term storage, humidity should preferably be kept at 20% or below.

📄 File Download: technical files and certificates

• PET-CF Parameters for Bambu Lab & Creality — starting profiles and printing parameters.
• TDS — technical data sheet.
• MSDS/SDS — material safety data sheet.
• REACH — SVHC report.
• RoHS — restricted substances report.

Safety during printing and post-processing

eSUN PET-CF is not classified as a hazardous chemical under GHS, but standard safety measures should be followed during printing and post-processing. Print in a well-ventilated area and avoid overheating, open flames, sparks and hot surfaces.

When sanding, drilling, cutting or mechanically processing PET-CF parts, safety glasses and a mask are recommended. Dust from carbon-fiber-filled materials should not be inhaled, so post-processing should be performed carefully, with ventilation and proper cleaning of the work area.

FAQ

Why buy eSUN PET-CF

eSUN PET-CF is an engineering material for users who need rigid, stable and heat-resistant parts with a matte carbon-fiber surface. It is suitable for functional prototypes, housings, brackets, industrial fixtures, automotive components, tool fixtures and technical products where standard PETG or PLA no longer provides the required level of rigidity and temperature resistance.