Articles on: Printer setups

Bambu Lab: LAN-only mode and Developer Mode - how to enable

To use SimplyPrint with a Bambu Lab printer on current firmware, you need to enable LAN-only Mode and Developer Mode on the printer. Both. This guide walks through enabling them and finding the access code SimplyPrint needs.

Background on why this is required: Bambu Lab: printer stopped working after firmware upgrade and LAN-only vs Bambu Cloud.

What is LAN-only Mode?

LAN-only Mode disconnects the printer from Bambu Lab's cloud. The printer only talks to devices on your local network, including the SimplyPrint Bambu Lab Client (the bridge software running on your Pi, mini PC, or Mac).

This is what allows SimplyPrint to send commands to the printer on current firmware. With Bambu's Authorization Control System, printers in Cloud mode block third-party write actions; printers in LAN-only Mode with Developer Mode do not.

What is Developer Mode?

Developer Mode is a per-printer toggle Bambu Lab added alongside the ACS rollout. When LAN-only Mode is enabled, Developer Mode is what allows local applications to actually drive the printer (start prints, set temperatures, send movement commands). Without it, you'd see the printer in SimplyPrint but couldn't do anything with it.

Developer Mode shipped in these firmware versions:

X1 series - 01.08.03.00 and later
A1 series - 01.05.00.00 and later
P1 series - 01.08.02.00 and later
H2D - 01.01.00.01 and later
P2 series - shipped with Developer Mode from the start

If your printer is on older firmware than these versions, you don't need Developer Mode yet, but you also don't have ACS restrictions. As soon as you update to a version that has Developer Mode, you'll need to enable both modes to keep SimplyPrint working.

Enabling LAN-only Mode

On the printer screen:

Go to Settings.
Open WLAN / Network settings.
Toggle LAN-only Mode on.

After enabling LAN-only Mode for the first time, power-cycle the printer.

Bambu Lab's own guide: Enable Developer Mode (Bambu Lab wiki). Video walkthrough for P1 and A1 series:

Enabling Developer Mode

Once LAN-only Mode is enabled, a Developer Mode option appears in the same settings menu. Toggle it on. That's it.

If you don't see the Developer Mode option, your firmware is older than the versions listed above and doesn't have it yet.

Finding your printer's access code

SimplyPrint needs the printer's access code to connect. The code is shown on the printer screen in the LAN-only Mode area, and the exact path varies by model:

Model	Where to find the access code
A1 / A1 Mini	Settings > WLAN / Network > LAN-only Mode
P1P / P1S	Settings > WLAN / Network
X1 / X1C / X1E	Settings > LAN Mode
H2D / P2 series	Settings > LAN Mode

On A1 / A1 Mini you need to enable LAN-only Mode first to see the code. If the code is all zeros, toggle LAN-only Mode off and back on.

Enter this code in the SimplyPrint Bambu Lab Client when adding the printer. If you change firmware versions and the code rotates (it sometimes does), update it in the client to reconnect.

After enabling: what changes

Full SimplyPrint functionality is restored on current firmware: start prints, AMS control, temperature control, movement, statistics.
Bambu Handy stops working for this printer. Bambu's app requires Cloud mode. The SimplyPrint mobile app covers the same ground (control, status, AMS, webcam) and more.
Firmware updates via Bambu Handy stop working. Use the offline USB / microSD method, or briefly switch modes. See How to update Bambu Lab firmware in LAN-only mode.
You'll need a USB stick or microSD card in the printer for file transfers in LAN-only Mode.

Updated on: 25/05/2026

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