MQTT Command Verification Failed #854

New Issue

MrUnknownDE · 2026-04-05T16:33:10+02:00

MrUnknownDE commented

2026-04-05 16:33:10 +02:00

Originally created by @DerRobba on 2/7/2026

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.0, 2.3.1, 2.3.2-dev

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

CPU: Core Ultra 285K
RAM: 64GB DDR5 (2x32gb) + 2x light enhancement kit
GPU: Zotac GeForce RTX 5070 Ti
PSU: 1200w

Printer

Bambu Lab A1 Combo

How to reproduce

Open Orca Slicer
Load 3mf
slice
click "print"
confirm
6.nothing happens

Actual results

It says send via cloud service then it counts down and then it just doesnt do anything. meanwhile the printer says MQTT Command Verification Failed. My server is running a MQTT Broker, but there shouldnt be anything connected to it. I even tried running back the firmware to version 01.07.00.00, but it didnt help at all.

Expected results

it sends the print and starts printing

Project file & Debug log uploads

project file:
irrelevant, happens with all prints
log files:
log.zip

Checklist of files to include

Log file
Project file

Anything else?

Well, Bambu Studio works like a charm just like the bambu hamdy app

*Originally created by @DerRobba on 2/7/2026* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.0, 2.3.1, 2.3.2-dev ### Operating System (OS) Windows ### OS Version Windows 11 ### Additional system information CPU: Core Ultra 285K RAM: 64GB DDR5 (2x32gb) + 2x light enhancement kit GPU: Zotac GeForce RTX 5070 Ti PSU: 1200w ### Printer Bambu Lab A1 Combo ### How to reproduce 1. Open Orca Slicer 2. Load 3mf 3. slice 4. click "print" 5. confirm 6.nothing happens ### Actual results It says send via cloud service then it counts down and then it just doesnt do anything. meanwhile the printer says MQTT Command Verification Failed. My server is running a MQTT Broker, but there shouldnt be anything connected to it. I even tried running back the firmware to version 01.07.00.00, but it didnt help at all. ### Expected results it sends the print and starts printing ### Project file & Debug log uploads project file: irrelevant, happens with all prints log files: [log.zip](https://github.com/user-attachments/files/25151976/log.zip) ### Checklist of files to include - [x] Log file - [ ] Project file ### Anything else? Well, Bambu Studio works like a charm just like the bambu hamdy app

MrUnknownDE closed this issue

2026-04-05 16:33:10 +02:00

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Reference: github/OrcaSlicer#854