HTTP 500 Upload Error with Anycubic LAN in Orca 2.3.2-dev (“slice bounds out of range [:3] with length 1”) #1007

New Issue

MrUnknownDE · 2026-04-05T16:41:35+02:00

MrUnknownDE commented

2026-04-05 16:41:35 +02:00

Originally created by @obelinchen on 1/21/2026

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.2-dev Build c906075 (multiple nightly builds tested)

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

Summary
When uploading a sliced file to an Anycubic Kobra 3 Max over LAN using the Octo/Klipper host type, Orca Slicer 2.3.2-dev throws an HTTP 500 error from the printer. The same printer + LAN setup works perfectly in Orca 2.3.1 stable.

This looks like a regression in the 2.3.2-dev LAN upload code path.

Printer

Anycubic Kobra 3 Max - Printer firmware: latest official Anycubic firmware (LAN mode enabled)

How to reproduce

Add a new printer profile (custom parameters for Kobra 3 Max)

Add a LAN device via Host Type: Octo/Klipper

Enter the printer’s IP address (no port)

Slice any model

Click Upload and Print

Actual results

Additional behaviour on the printer:

The printer starts heating the print bed,

The display shows:
“Dateien herunterladen: bitte warten” (Downloading files: please wait)

…and then the upload fails and the printer does nothing further.

This indicates that the printer does enter its LAN-download mode,
but crashes when processing the incoming request structure.

Expected results

Upload should succeed (as in Orca 2.3.1 stable), and the file should appear in the printer storage, followed by normal print start.

Project file & Debug log uploads

No project files or logs attached because the issue happens with any sliced project.
If you need a specific file later, I can upload one.
Thanks for all your work on Orca!

Checklist of files to include

Log file
Project file

Anything else?

Just wanted to report this so you're aware of it.
If you need any further info to reproduce it, I can provide it.

And thanks to everyone working on Orca — great project,
and your work is really appreciated. 🙂

*Originally created by @obelinchen on 1/21/2026* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.2-dev Build c906075 (multiple nightly builds tested) ### Operating System (OS) Windows ### OS Version Windows 11 ### Additional system information Summary When uploading a sliced file to an Anycubic Kobra 3 Max over LAN using the Octo/Klipper host type, Orca Slicer 2.3.2-dev throws an HTTP 500 error from the printer. The same printer + LAN setup works perfectly in Orca 2.3.1 stable. This looks like a regression in the 2.3.2-dev LAN upload code path. ### Printer Anycubic Kobra 3 Max - Printer firmware: latest official Anycubic firmware (LAN mode enabled) ### How to reproduce Add a new printer profile (custom parameters for Kobra 3 Max) Add a LAN device via Host Type: Octo/Klipper Enter the printer’s IP address (no port) Slice any model Click Upload and Print ### Actual results ![Image](https://github.com/user-attachments/assets/81ac3e85-31a0-4377-b3d2-f5b29f1b7eff) Additional behaviour on the printer: The printer starts heating the print bed, The display shows: “Dateien herunterladen: bitte warten” (Downloading files: please wait) …and then the upload fails and the printer does nothing further. This indicates that the printer does enter its LAN-download mode, but crashes when processing the incoming request structure. ### Expected results Upload should succeed (as in Orca 2.3.1 stable), and the file should appear in the printer storage, followed by normal print start. ### Project file & Debug log uploads No project files or logs attached because the issue happens with any sliced project. If you need a specific file later, I can upload one. Thanks for all your work on Orca! ### Checklist of files to include - [ ] Log file - [ ] Project file ### Anything else? Just wanted to report this so you're aware of it. If you need any further info to reproduce it, I can provide it. And thanks to everyone working on Orca — great project, and your work is really appreciated. 🙂

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Dependencies

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Reference: github/OrcaSlicer#1007