Articles on: Troubleshooting

Why does my Bambu Lab printer show as "Not connected"?

If your Bambu Lab printer shows as "Not connected" in SimplyPrint, it means the SimplyPrint Bambu Lab Client (the application running on a PC, Raspberry Pi, or always-on device that SimplyPrint uses to talk to your Bambu printer) is reachable, but the client itself can't reach the printer.

This is rarer than the OctoPrint not-connected state, but it does happen. Most often it's a network or printer-side configuration issue, not a SimplyPrint issue.

If the entire Bambu Lab Client is unreachable (not just one printer), you'll see "Offline" instead - see Why is my Bambu Lab printer offline?, specifically the "Online in client but offline in SimplyPrint" section.

Quick checklist

Is the printer powered on?
Is the printer on the same network as the device running the SimplyPrint Bambu Lab Client?
Are LAN-only Mode and Developer Mode enabled on the printer?
Does the access code in SimplyPrint match the one on the printer screen?

1. Printer is powered off or on a different network

Bambu printers need to be on the same local network as the device running the SimplyPrint Bambu Lab Client. They will not connect over the public internet.

Common gotchas:

Setup issue	Fix
Printer on guest WiFi	Move printer to main network
Printer on a separate VLAN	Move to same VLAN as the client
Printer on 5 GHz, client on 2.4 GHz (or vice versa) on a network that isolates bands	Connect both to the same band, or unify the SSID
Client running on a sleeping laptop	Use an always-on device (Pi, mini PC) instead

Quick test: From the device running the client, try to ping the printer's IP (ping <printer-ip> in a terminal). If that fails, fix the network first - SimplyPrint can't help here.

2. Access code mismatch

The access code is what lets the SimplyPrint Bambu Lab Client talk to your printer. It must match exactly.

Find it on your printer:

Model	Location
A1 / A1 Mini	Settings > WLAN/Network > LAN-only Mode
P1P / P1S	Settings > WLAN/Network
X1 / X1C / X1E	Settings > LAN Mode
H2D / P2	Settings > LAN Mode

If the access code changed (some firmware updates rotate it), update it in SimplyPrint or re-add the printer.

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.

3. LAN-only Mode + Developer Mode

For full SimplyPrint functionality, both modes need to be enabled on the printer:

LAN-only Mode - enabled
Developer Mode - enabled

Without Developer Mode you may see the printer but can't actually start prints. Full instructions: LAN-only Mode and Developer Mode - how to enable.

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

4. Was it working before?

If your Bambu printer was connecting fine and then stopped:

Did the printer firmware update recently? Some updates reset LAN-only Mode or rotate the access code. Re-enable Developer Mode and re-check the code.
Did the SimplyPrint Bambu Lab Client update? Restart the client. On Windows, end all SimplyPrint processes in Task Manager and start it again.
Did your router or network change? The printer may have a new IP. Check the printer screen for the current IP.

For more on post-firmware-update issues: Printer stopped working after firmware upgrade.

5. Test with BambuStudio

Not sure if it's a SimplyPrint issue or a network/printer issue?

Install BambuStudio on the same device running the SimplyPrint Bambu Lab Client.
Add the printer using the same IP, access code, and serial number.
Try to connect.

BambuStudio	SimplyPrint	Problem is
Works	Doesn't work	SimplyPrint client (gather logs, post on Discord)
Doesn't work	Doesn't work	Network, printer, or firmware
Can see, can't print	Can see, can't print	Developer Mode not enabled

Still stuck?

Get your client logs (Where to find logs) and post on:

SimplyPrint Discord: simplyprint.io/discord

Updated on: 25/05/2026

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