Anycubic Kobra S1 Filament

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The right Anycubic Kobra S1 filament is what unlocks the engineering-grade printing the S1 was built for.

Siraya Tech makes premium 1.75 mm filament tuned for the Kobra S1, Anycubic's first fully enclosed CoreXY printer. With a 320°C hotend, 120°C bed, and passively heated chamber, the S1 handles materials that bed-slingers cannot. Our Fibreheart engineering filaments, carbon-fiber blends, and Flex TPU lineup are matched to that capability.

Print real engineering parts — ABS, ASA, PETG-CF Pro, PPA-CF — without warping, jams, or layer cracking on long industrial runs.

Engineered for the Kobra S1's CoreXY Chamber: Tuned for the S1's 320°C hotend, 120°C bed, enclosed CoreXY frame, and 600 mm/s ceiling. Pairs with hardened steel nozzles for abrasive carbon-fiber and glass-fiber blends.

Engineering Filament Built for an Enclosed CoreXY

The S1's enclosure traps enough heat for ABS, ASA, and fiber-reinforced filaments. That changes what you can realistically print compared to the open-frame Kobra 3.

Carbon-fiber blends — ABS-CF, PETG-CF Pro, PET-CF, and PPA-CF for structural rigidity.
Glass-fiber blends — ASA-GF and PPA-GF for outdoor durability and chemical resistance.
High-flow chemistry — matched to the S1's 300 mm/s recommended speed and 20,000 mm/s² acceleration.
Pre-dried packaging — engineering filaments ship sealed and ready to print straight from the bag.

Pick the Right Engineering Filament for Your Kobra S1 Build

The Kobra S1 handles a wider range than other Kobras because of its enclosure and higher hotend ceiling. Match the material to the load and environment.

Material	Best For	Hardened Nozzle?	Key Strength
ABS-CF	Industrial brackets, jigs, automotive parts	Yes	Strong, heat resistant, low warping
ASA-GF	Outdoor gear, UV-exposed parts	Yes	Weather and UV resistant
PETG-CF Pro HF	Stiff brackets, drone frames, tools	Yes	HDT 76°C, high-flow, matte finish
PPA-CF Core	High-strength engineering parts	Yes	25% carbon fiber, low moisture
PET-CF	Lightweight aerospace and drone parts	Yes	Strong, dimensionally stable
Flex TPU 64D	Gears, rollers, wear parts	No	Semi-rigid, abrasion resistant

ABS-CF and ASA-GF for Industrial Strength

The S1's enclosure traps enough chamber heat for ABS-CF and ASA-GF to print without major warping. Our ABS-CF uses chopped carbon fiber (not powder) for true structural reinforcement, while ASA-GF resists UV degradation for outdoor parts.

PETG-CF Pro for High-Speed Engineering

Need stiffness without the difficulty of ABS? PETG-CF Pro HF prints at speeds up to 25 mm³/s with chopped carbon fiber and an HDT of 76°C. It is one of the easiest engineering filaments to print on the S1.

PPA-CF Core for Maximum Stiffness

The S1's 320°C hotend hits the temperature range where PPA-CF performs best. Our PPA-CF Core uses 25% concentrated carbon fiber with a pure PPA outer shell for superior layer adhesion and reduced nozzle wear.

Flex TPU on the S1 Direct Drive

The S1's direct drive handles TPU in single-color mode. Flex TPU 64D gives you semi-rigid wear-resistant parts, while the Flex TPU Air 65A-82A blend covers lightweight wearables.

Note: Always swap to a hardened steel nozzle on your Kobra S1 before printing any carbon-fiber or glass-fiber filament. The stock brass nozzle wears out fast on abrasive blends.

Why Professional Makers Choose Siraya Tech

We are chemists and engineers building filament for serious work, not just hobby prints.

Our Fibreheart engineering line is tested on enclosed CoreXY printers like the Kobra S1, so your ABS-CF, ASA-GF, and PPA-CF Core prints come out the way you sliced them, every time.

Featured Filaments for the Anycubic Kobra S1

Frequently Asked Questions

What filament does the Kobra S1 support?

The Kobra S1 supports PLA, PETG, TPU, ABS, ASA, PC, PA, and carbon or glass fiber blends. The 320°C hotend, 120°C bed, and enclosed CoreXY frame handle most engineering filaments. A hardened steel nozzle is required for abrasive fiber materials.

Can the Kobra S1 print ABS without an enclosure heater?

Yes. The S1 is passively enclosed. The chamber traps heat from the bed and hotend, which is enough for ABS and ASA. It is not active chamber heating, so the S1 still struggles with high-temp materials that need controlled ambient temps.

What is the max nozzle temperature on the Kobra S1?

The S1 hotend reaches 320°C. That covers carbon-fiber-reinforced PETG, PPA, ABS, ASA, and PA reliably. Pure materials that need above 320°C are outside its range.

Do I need a hardened nozzle for carbon fiber on the Kobra S1?

Yes. The stock 0.4 mm brass nozzle wears out quickly with carbon-fiber or glass-fiber filaments. Swap to a hardened steel nozzle before printing any reinforced material.

How fast can the Kobra S1 print?

Anycubic rates the S1 at a recommended 300 mm/s with a maximum of 600 mm/s and 20,000 mm/s² acceleration. CoreXY motion handles those speeds better than the Kobra 3 bed-slinger. Real speeds depend on the material.