Spectrum PETG CF ReFill 1.75mm 1kg

Spectrum PETG CF ReFill filament carbon fiber brings professional-grade composite printing to your desktop machine, combining the ease of PETG with the structural advantages of short carbon fiber reinforcement. Whether you are prototyping functional parts, producing lightweight enclosures, or replacing metal brackets in low-stress applications, this filament delivers a compelling balance of rigidity, surface quality, and printability that pure PETG simply cannot match.

What Makes Spectrum PETG CF ReFill Filament Carbon Fiber Stand Out

At its core, PETG CF is a blend of polyethylene terephthalate glycol and chopped carbon fibers. The carbon fiber content stiffens the polymer matrix without dramatically increasing brittleness, which is the common trade-off when working with nylon-CF or PA-CF blends. The result is a material with noticeably higher flexural modulus than standard PETG, lower layer delamination risk compared to PLA-CF, and a characteristic matte finish that many engineers and designers find more presentable than the typical glossy PETG surface.

Spectrum Filaments has built its reputation on tight diameter tolerances and consistent pigment dispersion across its entire product line. You can visit their official website to review full technical datasheets, including tensile strength, heat deflection temperature, and recommended processing windows for every material they produce. This transparency is exactly what you need when qualifying a filament for a repeatable production workflow.

ReFill Format — Practical and Sustainable

The ReFill variant ships the 1 kg spool of filament wound on a lightweight cardboard core rather than a heavy plastic spool. The practical upside is straightforward: you mount it on a compatible spool holder, use the material, and discard or recycle significantly less plastic when the roll is finished. For studios running multiple materials simultaneously, the reduced storage footprint of ReFill spools adds up quickly. The cardboard core is also easier to flatten and dispose of responsibly than a rigid plastic hub.

At 1.75 mm diameter, the Spectrum PETG CF ReFill filament carbon fiber works with virtually every FDM printer on the market today, from budget Bowden machines to high-end direct-drive systems. Because carbon fiber particles are abrasive, a hardened steel or ruby nozzle is strongly recommended. Standard brass nozzles will wear noticeably within a few hundred grams of material, which shifts tolerances and degrades surface finish over time.

Recommended Print Settings

Spectrum recommends a nozzle temperature between 240 °C and 260 °C for this grade of PETG CF. Bed temperature should sit in the 70–85 °C range, and a clean PEI or glass surface with light adhesion treatment gives the best first-layer adhesion. Print speeds of 40–60 mm/s are a sensible starting point; pushing beyond that can introduce under-extrusion as the fiber-filled melt has slightly higher viscosity than unfilled PETG. An enclosure is not strictly required but reduces warping on larger flat parts and shields the print from ambient drafts that cause layer separation.

Retraction settings may need tuning — PETG CF tends to string less than transparent PETG, but it is still worth running a retraction calibration tower when moving to a new printer profile.

Typical Applications

Parts printed with Spectrum PETG CF ReFill filament carbon fiber are routinely used in drone frames and motor mounts, cable management clips in industrial enclosures, jigs and fixtures for light assembly work, cosmetic automotive interior panels, and RC vehicle body components. The matte dark surface also photographs well, which makes it a preferred choice for product prototypes that go directly into client presentations without post-processing.

If you are exploring the full range of engineering-grade and specialty options available, browse our complete filament category to compare carbon fiber composites, high-temperature materials, flexible filaments, and more.

Ready to Order?

Add the Spectrum PETG CF 1.75 mm 1 kg ReFill spool to your cart today and upgrade your next structural print. Stock levels on specialty composite filaments fluctuate, so secure your roll now and keep your production schedule on track.