CLI multi-extruder slicing fails on H2/H2D (filament_ids validation error and assemble_list segfault) #115

New Issue

MrUnknownDE · 2026-04-05T16:18:30+02:00

MrUnknownDE commented

2026-04-05 16:18:30 +02:00

Originally created by @GummyLight on 3/28/2026

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.2 (macOS build)

Operating System (OS)

macOS

OS Version

macOS Tahoe 26.3.1

Additional system information

CPU: Apple Silicon (M-4)
RAM: 16 GB
GPU: integrated Apple GPU

Printer

Bambu Lab H2D

How to reproduce

Filament IDs path (fails with exit 254)

FIL="/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/filament/Bambu PLA Basic @BBL H2D.json"
/Applications/OrcaSlicer.app/Contents/MacOS/OrcaSlicer
--load-settings "/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/machine/Bambu Lab H2D 0.4 nozzle.json;/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/process/0.20mm Standard @BBL H2D.json"
--load-filaments "$FIL;$FIL;$FIL;$FIL;$FIL"
--load-filament-ids "1,1,1,1,1"
--slice 0
--export-3mf output/cube1_cli_orca.3mf
model/cube1.st

2.Assemble list path (segfault exit 139)
FIL="/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/filament/Bambu PLA Basic @BBL H2D.json" &&
/Applications/OrcaSlicer.app/Contents/MacOS/OrcaSlicer
--load-assemble-list assemble_list.json
--load-settings "/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/machine/Bambu Lab H2D 0.4 nozzle.json;/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/process/0.12mm Fine @BBL H2D.json"
--load-filaments "$FIL;$FIL;$FIL;$FIL;$FIL"
--slice 0
--export-3mf output/cube1_cli_orca_assemble.3mf

Actual results

Repro 1: CLI aborts with loaded_filament_ids size 5 should be the same with input files size 1 (exit code 254). It appears filament_ids count is being validated against input file count instead of extruder count.
Repro 2: CLI crashes with segmentation fault (exit code 139) when using --load-assemble-list.
GUI with the same machine/process/filament profiles slices successfully and produces 3MF.

Expected results

CLI should accept multiple filament_ids for a single STL/plate when the machine has multiple extruders.
--load-assemble-list should complete without crashing and produce the same output as GUI for identical profiles.

Project file & Debug log uploads

orca_cli_bug_bundle.zip

Checklist of files to include

Log file
Project file

Anything else?

Machine profile used: Bambu Lab H2D 0.4 nozzle.
Process profile used: 0.20mm Standard @BBL H2D.
Filament profile used: Bambu PLA Basic @BBL H2D (five copies to match extruder count).
CLI parity with GUI would unblock automated multi-extruder slicing for H2/H2D.

*Originally created by @GummyLight on 3/28/2026* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.2 (macOS build) ### Operating System (OS) macOS ### OS Version macOS Tahoe 26.3.1 ### Additional system information CPU: Apple Silicon (M-4) RAM: 16 GB GPU: integrated Apple GPU ### Printer Bambu Lab H2D ### How to reproduce 1. Filament IDs path (fails with exit 254) FIL="/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/filament/Bambu PLA Basic @BBL H2D.json" \ /Applications/OrcaSlicer.app/Contents/MacOS/OrcaSlicer \ --load-settings "/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/machine/Bambu Lab H2D 0.4 nozzle.json;/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/process/0.20mm Standard @BBL H2D.json" \ --load-filaments "$FIL;$FIL;$FIL;$FIL;$FIL" \ --load-filament-ids "1,1,1,1,1" \ --slice 0 \ --export-3mf output/cube1_cli_orca.3mf \ model/cube1.st 2.Assemble list path (segfault exit 139) FIL="/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/filament/Bambu PLA Basic @BBL H2D.json" && \ /Applications/OrcaSlicer.app/Contents/MacOS/OrcaSlicer \ --load-assemble-list assemble_list.json \ --load-settings "/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/machine/Bambu Lab H2D 0.4 nozzle.json;/Applications/OrcaSlicer.app/Contents/Resources/profiles/BBL/process/0.12mm Fine @BBL H2D.json" \ --load-filaments "$FIL;$FIL;$FIL;$FIL;$FIL" \ --slice 0 \ --export-3mf output/cube1_cli_orca_assemble.3mf ### Actual results Repro 1: CLI aborts with loaded_filament_ids size 5 should be the same with input files size 1 (exit code 254). It appears filament_ids count is being validated against input file count instead of extruder count. Repro 2: CLI crashes with segmentation fault (exit code 139) when using --load-assemble-list. GUI with the same machine/process/filament profiles slices successfully and produces 3MF. ### Expected results CLI should accept multiple filament_ids for a single STL/plate when the machine has multiple extruders. --load-assemble-list should complete without crashing and produce the same output as GUI for identical profiles. ### Project file & Debug log uploads [orca_cli_bug_bundle.zip](https://github.com/user-attachments/files/26320107/orca_cli_bug_bundle.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? Machine profile used: Bambu Lab H2D 0.4 nozzle. Process profile used: 0.20mm Standard @BBL H2D. Filament profile used: Bambu PLA Basic @BBL H2D (five copies to match extruder count). CLI parity with GUI would unblock automated multi-extruder slicing for H2/H2D.

MrUnknownDE added the bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug labels 2026-04-05 16:18:31 +02:00

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Reference: github/OrcaSlicer#115