KX-Bridge – Anycubic Kobra X Klipper Bridge

Version: 0.9.1-beta15 Status: Public Beta – suitable for home users, feedback welcome

KX-Bridge is a Moonraker-compatible HTTP/WebSocket bridge for the Anycubic Kobra X 3D printer. It allows you to control the printer through OrcaSlicer and other Moonraker-compatible software — no Klipper, no Raspberry Pi required.

---

What's supported?

• Printer status (temperature, progress, state)
• File transfer and print start
• Print control: pause, resume, cancel
• Temperature control during an active print
• Print speed (Silent / Normal / Sport)
• AMS filament change (load / unload)
• Light and fan control
• Web UI with dashboard, temperature cards, axis control, and camera view
• Settings and self-update directly in the browser (⚙ menu)
• OrcaSlicer connection (Moonraker protocol)

---

Requirements

• Anycubic Kobra X on your local network, with LAN mode enabled (printer menu → enable LAN mode)
• Printer MQTT credentials (→ see Extracting credentials)
• Docker or Python 3.9+ or the pre-built Linux binary

---

Quick start – Docker (recommended)

# 1. Start the bridge
./start.sh

start.sh builds the Docker image automatically on first run and starts the bridge.

# 2. Open the web UI: http://BRIDGE-IP:7125
#    → Settings (⚙) open automatically on first start
#    → Enter your credentials (→ see Extracting credentials)

# 3. In OrcaSlicer: add printer → "Moonraker" → http://BRIDGE-IP:7125

Check logs:

docker-compose logs -f

Stop:

docker-compose down

---

Quick start – Binary (Linux)

chmod +x kx-bridge
./kx-bridge

Open the web UI: http://localhost:7125
→ Settings (⚙) open automatically and guide you through the initial setup.

---

Quick start – Python directly

pip install aiohttp
python kobrax_moonraker_bridge.py

Open the web UI: http://localhost:7125
→ Settings (⚙) open automatically on first start.

---

Extracting credentials

The MQTT credentials are printer-specific and are generated on first connection with AnycubicSlicerNext. The extract_credentials tool reads them from the memory of the running slicer.

Requirement: AnycubicSlicerNext must be running and connected to the printer (printer status is shown).

Windows

extract_credentials.exe

Linux

chmod +x extract_credentials
./extract_credentials

Output

[*] Process found: AnycubicSlicerNext.exe (PID 1234)
[*] 1986 memory segments read (738.8 MB)
[*] Analyzing ... 100% (739 MB)

=======================================================
  RESULTS
=======================================================
  Username      userXXXXXXXXXX  (hits: 47)
  Password      ***************  (hits: 1046)
  Device-ID     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  (hits: 3504)
  Printer IP    192.168.x.x  (hits: 3036)
=======================================================

Enter the displayed values in the bridge settings:
Open web UI → ⚙ Settings → fill in the fields → Save & Restart

If the result looks uncertain: --verbose shows all found candidates.

All credentials are processed locally only — nothing is sent to external servers.

---

Configuration (.env)

PRINTER_IP=192.168.x.x       # Printer IP address
MQTT_PORT=9883                # Default, do not change
MQTT_USERNAME=userXXXXXXXX   # Starts with "user"
MQTT_PASSWORD=XXXXXXXXXXXXXX  # ~15 characters, mixed case
DEVICE_ID=xxxxxxxx...         # 32-character hex string
MODE_ID=20030                 # Kobra X default

---

OrcaSlicer setup

1. Add printer → Anycubic Kobra X (or generic Klipper printer)
2. Connection type: Moonraker
3. Host: http://BRIDGE-HOST:7125
4. Test connection → should show "Online"

---

Web UI

The bridge serves a web interface at http://BRIDGE-HOST:7125:

Section	Function
Dashboard	Printer status, progress, temperature overview
Temperatures	Set nozzle and bed temperature directly
Motion	X/Y/Z movement, motor release
Print Speed	Silent / Normal / Sport
Fan / Light	Fan speed and work light
AMS	Load / unload filament
Camera	Live preview (if supported by printer)
⚙ Settings	MQTT credentials, poll interval, self-update

Self-update

The ⚙ menu in the web UI lets you check for new versions and update the bridge in place — no reinstallation needed. After the download the bridge restarts automatically with the new version.

---

bridge.sh (Linux service manager)

./bridge.sh start    # Start bridge in background
./bridge.sh stop     # Stop bridge
./bridge.sh restart  # Restart
./bridge.sh status   # Check status and port
./bridge.sh log 50   # Show last 50 log lines

---

Printer states

The bridge translates internal Kobra states into Moonraker-compatible states:

Kobra state	Meaning
free	Ready
printing / busy	Printing
pausing / paused	Paused
resuming / resumed	Resuming
stopping / stoped	Stopping
finished	Complete
canceled	Cancelled
failed	Error

---

Troubleshooting

Port 7125 already in use:

./bridge.sh stop    # or: fuser -k 7125/tcp
./bridge.sh start

Invalid credentials / connection refused:

• Start AnycubicSlicerNext, connect to the printer, then run extract_credentials again
• If the result looks uncertain: extract_credentials --verbose shows all candidates
• Manually enter the correct candidate in .env and restart the bridge

Temperature changes are ignored:

• During an active print, temperature changes are sent via a separate channel — this is normal and the bridge handles it automatically.

Docker: Permission denied:

sudo usermod -aG docker $USER
# Log out and back in

Docker: .env not found:

# .env must be in the same directory as docker-compose.yml
cp .env.example .env && nano .env

---

Logs

# Docker
docker compose logs -f kx-bridge

# Binary / Python
tail -f /tmp/bridge.log   # when using bridge.sh

---

Security notes

• The bridge binds to 0.0.0.0:7125 by default — use on your local network only
• .env contains printer credentials — do not share publicly
• The credentials are printer-specific and have no access to Anycubic cloud services

---

License & legal

This project was created through interoperability research under §69e UrhG (German copyright law).
For private, non-commercial use only.