Printer Filament Guide

Best Filament for the Anycubic Kobra S1

Anycubic's first fully enclosed CoreXY: a 320°C hotend in a closed box, the natural pick for ABS and ASA.

Last updated: June 2026

The Kobra S1 is Anycubic's first fully enclosed CoreXY machine, and it changes the filament calculus versus the open Kobra 3 bed-slingers. The closed frame traps heat, the hotend goes to 320°C, and the bed hits 120°C. That combination makes ABS and ASA realistic rather than a fight. It runs CoreXY for speed (600mm/s ceiling, 300mm/s recommended) and takes the same ACE Pro as the Kobra 3 for four-color printing.

What the Anycubic Kobra S1 prints well

Recommended materials for this printer:

PLA PLA+ PETG TPU ABS ASA PC Nylon

Fit a hardened nozzle before any carbon- or glass-fibre filament, since the stock nozzle isn't abrasive-rated. Everything non-abrasive prints out of the box.

Cheapest filament for the Anycubic Kobra S1 right now
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One important distinction: the base S1 is passively enclosed, not actively chamber-heated. The enclosure retains heat radiating off the bed and hotend, which is enough to print ABS/ASA far better than an open frame, but it isn't a controlled hot chamber for high-temp PC/PA. The hotend is a direct-drive metal unit; the stock nozzle is brass, so abrasive composites still need a hardened-steel swap.

Anycubic Kobra S1 specs that affect filament

Build volume
250 × 250 × 250 mm
Enclosure
Enclosed
Heated chamber
No
Extruder
Direct drive
Max hotend temp
320°C
Stock nozzle
0.4 mm brass (supports 0.6/0.8 mm)
Abrasive-ready (CF/GF)
Needs hardened nozzle
Multi-material
ACE Pro (Combo bundles one; chain two for 8 colors; interchangeable with Kobra 3's ACE Pro)

The right pick if you want ABS, ASA and PETG done properly without building your own enclosure, plus optional multicolor. If you specifically need an actively heated chamber and abrasive-ready hardware out of the box, a high-temp enclosed machine is the better tool.

Filament notes for the Anycubic Kobra S1

  • ABS and ASA are the reason to buy this over a Kobra 3, since the enclosure retains heat and cuts warping dramatically.
  • PLA and PETG print fast and clean on the CoreXY motion system; drop the door open for PLA to avoid heat creep.
  • TPU 95A runs well via direct drive; keep speeds modest.
  • 320°C hotend gives more headroom than the Kobra 3, but the passive (non-heated) chamber limits true high-temp PC/PA.
  • Stock nozzle is brass, so install hardened steel before running CF or GF filament.
  • Supports 0.6/0.8mm nozzles for faster draft prints in PLA/PETG.
  • ACE Pro adds four-color printing plus 55°C drying; the unit is interchangeable with the Kobra 3's.
How SpoolHound tracks prices

The deals above are filtered to the materials the Anycubic Kobra S1 handles, aggregated from multiple retailers daily and normalised to cost per kg, so the cheapest in-stock option is always on top. Prices refresh every 24 hours and are region-aware, so switch your region in the nav. Click through to the retailer to confirm the live checkout price.

Frequently Asked Questions

Is the Kobra S1 enclosed, and does it have a heated chamber?
It's fully enclosed (Anycubic's first enclosed CoreXY), but the base S1 has no active chamber heater. The enclosure passively retains heat from the bed and hotend, which is enough for ABS and ASA but not for controlled high-temp PC/PA.
Can the Kobra S1 print ABS and ASA well?
Yes, and this is its main advantage over the open-frame Kobra 3. The enclosure traps heat, the bed reaches 120°C, and the hotend hits 320°C, so warping and layer cracking are far less of a problem than on an open bed-slinger.
Does the Kobra S1 handle carbon-fiber filament?
The hotend temperature is there, but the stock 0.4mm nozzle is brass and abrasive CF/GF will wear it out. Swap to a hardened steel nozzle first. The enclosure also helps CF-ABS and CF-ASA blends print without warping.
What multicolor system does the Kobra S1 use?
The same ACE Pro as the Kobra 3, a four-spool unit that also dries filament to 55°C. The Combo includes one; chain a second for eight colors. The ACE Pro is interchangeable between the Kobra 3 and S1.

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