Anycubic Hardened Steel Nozzle for Kobra X

The Anycubic Hardened Steel Nozzle for Kobra X is an original replacement nozzle designed for the quick-release hotend system of the Anycubic Kobra X and Kobra X Combo.

Hardened steel provides improved resistance to abrasive filament compared with conventional brass, making it particularly suitable for materials such as PLA-CF and PETG-CF. The Kobra X comes standard with a 0.4mm hardened-steel nozzle, while 0.6mm and 0.8mm hardened-steel options provide increased material flow for faster printing and larger parts.

Combined with the Kobra X's high-speed extrusion system and maximum hotend temperature of 300°C, these nozzles provide a durable solution for both everyday printing and compatible composite materials.

Key Features

• Original Anycubic hardened-steel nozzle

• Designed for Anycubic Kobra X and Kobra X Combo

• Available in 0.4mm, 0.6mm, and 0.8mm sizes

• Higher wear resistance than standard brass

• Suitable for compatible abrasive composite filaments

• Works with the Kobra X snap-lock quick-release hotend

• Supports high-speed printing workflows

• Suitable for replacement, maintenance, and nozzle-size changes

Hardened Steel Construction

Hardened steel is designed to withstand the abrasive particles found in many reinforced 3D printing materials.

Filaments containing carbon fiber can gradually wear a softer brass nozzle, enlarging the nozzle opening and affecting extrusion accuracy.

A hardened-steel nozzle provides improved durability when regularly printing materials such as:

• PLA-CF

• PETG-CF

• Other compatible abrasive composite filaments

It can also be used with conventional non-abrasive filament.

Available Nozzle Sizes

Anycubic currently offers hardened-steel Kobra X nozzles in three diameters.

The best nozzle size depends on the required balance between detail, material flow, print speed, and model size.

0.4mm Hardened Steel Nozzle

The 0.4mm hardened-steel nozzle is the standard configuration supplied with the Kobra X.

It provides a balanced combination of:

• Print detail

• Surface quality

• Material flow

• Layer-height flexibility

• General-purpose usability

It is suitable for users who want one nozzle for both standard filament and selected abrasive materials.

0.6mm Hardened Steel Nozzle

The 0.6mm nozzle provides a larger extrusion opening, allowing more material to flow through the hotend.

It is useful for:

• Faster printing

• Larger functional parts

• Carbon-fiber-filled filament

• Thicker walls

• Strong prototypes

• Reduced clogging risk with filled materials

The larger nozzle sacrifices some very fine detail in exchange for greater material throughput.

0.8mm Hardened Steel Nozzle

The 0.8mm version is designed for applications where high material flow and shorter production time are more important than maximum detail.

It is particularly suitable for:

• Large models

• Thick layers

• Rapid prototyping

• Large functional components

• High-flow extrusion

• Selected composite materials

A suitable slicer profile should always be used when changing to a larger nozzle diameter.

Quick-Release Hotend System

The Kobra X uses a snap-lock quick-release hotend design.

The hotend can be released through the locking mechanism, simplifying maintenance and making it easier to switch between different nozzle configurations.

This is useful for users who regularly change between:

• 0.4mm for general printing

• 0.6mm for faster functional printing

• 0.8mm for large high-flow models

Always allow the hotend to cool before servicing the toolhead.

Up to 300°C Hotend Temperature

The Kobra X supports a maximum nozzle temperature of:

300°C

This allows the printer to handle a broad range of compatible materials.

Anycubic officially lists Kobra X support for materials including:

• PLA

• PETG

• TPU

• PVA

• PLA-CF

• PETG-CF

• ASA

Actual printing temperature should always follow the recommendations for the selected filament rather than using the maximum hotend temperature by default.

Suitable for Abrasive Composite Filaments

The hardened-steel nozzle is particularly useful when printing carbon-fiber-filled filament.

Abrasive particles in these materials can wear softer nozzles over time, which may cause:

• Increased nozzle diameter

• Over-extrusion

• Reduced dimensional accuracy

• Inconsistent line width

• Poorer surface quality

Hardened steel significantly improves resistance to this type of wear.

Technical Specifications

Applications

• General FDM printing

• PLA printing

• PETG printing

• PLA-CF printing

• PETG-CF printing

• Functional prototypes

• Mechanical parts

• Large-format models

• High-flow printing

• High-speed printing

• Replacement of worn nozzle

• Print farm maintenance

Compatibility

Compatible with:

• Anycubic Kobra X

• Anycubic Kobra X Combo

Anycubic also lists the same hardened-steel nozzle family as compatible with:

• Anycubic Kobra 4 / Kobra 4 Combo

• Anycubic Kobra 3 Max V2 / Combo

Compatibility should still be confirmed according to the exact printer and hotend revision before installation.

Hardened Steel vs 0.25mm Brass Option

Anycubic separates the Kobra X nozzle range by material and diameter.

Hardened Steel

• 0.4mm

• 0.6mm

• 0.8mm

• Better suited to abrasive filament

Brass

• 0.25mm

• Intended primarily for fine-detail printing

The 0.25mm Kobra X nozzle should therefore not be described as a hardened-steel variant.

Package Includes

• 1 × Anycubic Hardened Steel Nozzle for Kobra X

Nozzle diameter depends on the selected variant.

Installation Note

Before replacing the nozzle:

• Switch off the printer

• Allow the hotend to cool completely

• Open the quick-release mechanism according to the Anycubic procedure

• Remove the existing hotend/nozzle assembly carefully

• Confirm the diameter of the replacement nozzle

• Install the replacement securely

• Close the locking mechanism correctly

• Update the nozzle diameter in the printer and slicer if changing sizes

• Run the appropriate calibration

• Check the first layer before starting a long print

Slicer Configuration

When changing nozzle diameter, update the nozzle settings in Anycubic Slicer Next or the selected compatible slicer.

Settings that may require adjustment include:

• Nozzle diameter

• Layer height

• Line width

• Flow rate

• Print speed

• Maximum volumetric flow

• Retraction

• Filament profile

Using settings intended for a different nozzle diameter can result in poor extrusion or inaccurate prints.

Usage Note

Choose the nozzle size according to the required balance between detail and material flow.

For normal general-purpose printing, the standard 0.4mm hardened-steel nozzle provides the most versatile configuration. For larger parts, abrasive composite filament, or faster extrusion, the 0.6mm or 0.8mm versions may be more suitable.