Anycubic Nozzle Hotend Kit with Heater Thermistor Nozzle for Kobra S1 Series

The Anycubic Nozzle Hotend Kit for Kobra S1 Series is a complete replacement hotend assembly designed for the Anycubic Kobra S1 and Kobra S1 Combo.

The integrated assembly combines the nozzle, heating components, and temperature sensing required to melt filament and maintain accurate extrusion temperature during printing. Its quick-release design allows the complete hotend to be removed from the toolhead without lengthy disassembly, making routine maintenance and nozzle changes easier.

Designed for temperatures up to 320°C, the Kobra S1 hotend supports a wide range of common and engineering filaments when paired with the appropriate nozzle material and printer settings.

Key Features

• Original-style replacement hotend for Anycubic Kobra S1 Series

• Compatible with Kobra S1 and Kobra S1 Combo

• Integrated nozzle, heater, and thermistor assembly

• Tool-free quick-release hotend design

• Maximum hotend temperature up to 320°C

• Available with different nozzle diameters

• Brass and hardened-steel nozzle options depending on variant

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

Integrated Hotend Assembly

The Kobra S1 uses an integrated hotend design that combines the nozzle and heating section into a compact replaceable assembly.

The hotend performs three main functions:

• Heating filament to the required extrusion temperature

• Measuring hotend temperature through the thermistor

• Extruding molten filament through the nozzle

Combining these components into one replaceable unit simplifies servicing compared with rebuilding the heater block, nozzle, and temperature sensor individually.

Quick-Release Design

The Kobra S1 hotend uses a quick-release mechanism.

After removing the required printhead cover, the locking mechanism can be released and the complete hotend removed from the toolhead.

This makes it easier to:

• Replace a worn nozzle

• Recover from severe clogs

• Change nozzle diameter

• Replace a damaged heating assembly

• Keep spare hotends ready for maintenance

Up to 320°C Printing Temperature

The Kobra S1 hotend supports temperatures up to:

320°C

The higher temperature capability allows the printer to work with a wider range of materials than basic low-temperature PLA-only hotends.

Actual filament compatibility also depends on:

• Nozzle material

• Printer enclosure

• Bed temperature

• Filament profile

• Material drying

• Extruder configuration

Always follow the recommended temperature range for the selected filament.

Multiple Nozzle Sizes

Anycubic offers Kobra S1 hotends in several nozzle diameters.

The standard Kobra S1 is supplied with a 0.4mm hotend.

Different nozzle sizes require appropriate slicer settings for line width, layer height, flow, and print speed.

Brass Nozzle Options

Anycubic currently lists all-metal brass hotends for the Kobra S1 in:

• 0.25mm

• 0.4mm

Brass provides good thermal conductivity and is suitable for common non-abrasive materials such as:

• PLA

• PETG

• ABS

• ASA

• TPU

• Other compatible standard filaments

Hardened Steel Nozzle Options

For more wear-resistant applications, Anycubic offers all-metal hardened-steel hotends in:

• 0.4mm

• 0.6mm

• 0.8mm

Hardened steel is better suited to abrasive materials such as compatible:

• PLA-CF

• PETG-CF

• Other carbon-fiber-filled filaments

• Selected reinforced composite filaments

Always confirm that the complete printer and filament profile are suitable for the selected engineering material.

Heater and Thermistor Included

This hotend kit includes the components required for heating and temperature monitoring within the hotend assembly.

The heater raises the nozzle to the selected printing temperature, while the thermistor provides temperature feedback to the printer.

Correct temperature feedback is important for:

• Stable extrusion

• Material flow consistency

• Safe heater operation

• Accurate filament melting

• Reliable print quality

Useful Replacement Part

Replacing the complete hotend may be appropriate when experiencing problems such as:

• Severe nozzle clog

• Damaged nozzle

• Hotend not heating

• Unstable temperature readings

• Thermistor fault

• Heater fault

• Filament leakage around the hotend

• Physical damage following a failed print

Correct diagnosis should be performed before replacement because similar symptoms may also originate from wiring, connectors, the toolhead board, or extrusion system.

Technical Specifications

Applications

• Kobra S1 hotend replacement

• Nozzle replacement

• Heater replacement

• Thermistor replacement

• Hotend clog repair

• Toolhead maintenance

• Switching nozzle diameter

• Printing abrasive filament with hardened-steel variants

• Preventive spare-part inventory

• Print farm maintenance

Compatibility

Compatible with:

• Anycubic Kobra S1

• Anycubic Kobra S1 Combo

• Kobra S1 configurations using the standard Kobra S1 toolhead

Not Compatible With

This hotend should not be assumed compatible with:

• Anycubic Kobra S1 Max

• Kobra X

• Kobra 4

• Kobra 3 Series

• Kobra 2 Series

The Kobra S1 Max uses a different hotend system with a maximum temperature of 350°C.

Package Includes

• 1 × Anycubic Kobra S1 Hotend Assembly

• 1 × Nozzle

• 1 × Heater

• 1 × Thermistor

The exact nozzle diameter and nozzle material depend on the selected product variant.

Installation Note

Allow the hotend to cool completely before removal.

Before replacement:

• Switch off the printer

• Disconnect mains power

• Remove the required toolhead cover

• Release the hotend locking mechanism

• Disconnect the heater and thermistor connections carefully

• Remove the existing hotend

• Install the replacement assembly fully into position

• Secure the quick-release mechanism

• Reconnect all electrical connections

• Reinstall the toolhead cover

• Confirm stable temperature readings before printing

After changing nozzle diameter, update the nozzle size in the printer and slicer profile before starting a print.

Troubleshooting Note

A hotend-related error does not always indicate that the complete hotend needs replacement.

Similar symptoms can be caused by:

• Loose electrical connectors

• Damaged wiring

• Extruder problems

• Incorrect filament settings

• Toolhead PCB faults

• Filament contamination

• Incorrectly installed hotend

Inspect the complete extrusion and heating system before replacing components.

Usage Note

Select the required nozzle diameter and material according to the intended application.

For normal PLA, PETG, and other non-abrasive materials, the brass version provides excellent thermal performance. For frequent printing with carbon-fiber-filled or other abrasive filaments, choose a compatible hardened-steel hotend to reduce nozzle wear.