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Bambu Bar
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Bambu Bar

Guide

Why controls are locked. And Developer Mode

Bambu Lab printers accept print commands from third-party apps only in LAN Only mode with Developer Mode on. Here's what that means, and whether it's worth turning on.

In short

Bambu Lab printers only accept pause, resume, stop and speed commands from third-party apps when the printer is in LAN Only mode with Developer Mode on. Until then, Bambu Bar shows a lock on those buttons and tells you why.

Reading status works in any mode, and the chamber light works either way. If you only want to watch prints, you don't need Developer Mode.

What's locked, and what isn't

In Bambu Bar Cloud mode LAN Only LAN Only + Developer Mode
Progress, temperatures, AMS, errors Yes Yes Yes
Chamber light Yes Yes Yes
Pause, resume, stop Locked Locked Yes
Print speed Locked Locked Yes

The lock is the printer's rule, not Bambu Bar's: the printer refuses these commands from apps other than Bambu Lab's own unless Developer Mode is on. Bambu Bar shows the lock and the reason, instead of buttons that silently do nothing.

What Developer Mode does

Bambu Lab describes Developer Mode as an option for advanced users that opens the printer's MQTT channel, live stream and FTP, "giving you full control over your printer and its network security". It's only available in LAN Only mode.

In practice:

  • Apps on your network that have the printer's access code can send it commands.
  • The printer stays in LAN Only, so Bambu Handy, remote printing and print history aren't available. See LAN mode explained.
  • You're responsible for your network's security: keep the access code private, and don't expose the printer to the internet.

Turn it on

Following Bambu Lab's Developer Mode guide:

  1. Turn on LAN Only on the printer's screen (Settings → LAN Only on X1, H2 and P2S; Settings → WLAN on P1; Settings → LAN Only Mode on the A series).
  2. On the same page, turn on Developer Mode.
  3. Read the notice, confirm it, and enable it. The switch turns green, or shows ON.
  4. If Bambu Bar was already connected, it unlocks the controls once the printer reports the new mode.

To undo it, turn Developer Mode off, then LAN Only off to return to cloud mode.

Should you turn it on?

  • You only watch prints: no. Status, the AMS, errors, notifications, widgets and the camera work without it.
  • You want to pause or stop from your Mac: yes, if you're happy to give up Bambu Handy and cloud features while it's on.
  • You need Bambu Handy away from home: keep cloud mode, and pause or stop from Handy or the printer's screen.

How Bambu Bar sends commands

Bambu Bar sends commands the same way it reads status: directly to the printer over an encrypted connection on your network, signed in with the access code, after checking the printer's certificate. Stop asks you to confirm first. See how local monitoring works.

Questions, answered

Why can't I pause or stop a print in Bambu Bar?

The printer is not in LAN Only mode with Developer Mode on. Bambu Lab printers refuse pause, resume, stop and speed commands from third-party apps otherwise. Bambu Bar shows a lock and the reason.

Does Developer Mode affect print quality?

No. It changes which apps the printer accepts commands from, not how it prints.

Can I use Bambu Handy with Developer Mode on?

No. Developer Mode needs LAN Only mode, and Bambu Handy isn't available in LAN Only mode.

Does the chamber light need Developer Mode?

No. Bambu Bar's chamber light switch works in any mode.

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