Orca Upload and Print fails on Cosmos: 'Unable to open file' (works via Mainsail and on OC patched)

[pdscomp]

Summary

User cj (Discord exuberant_moose_10593) cannot print over the network on Cosmos: OrcaSlicer's Upload and Print appears to succeed, Mainsail switches to the printer tab, but the file never appears in jobs and the Mainsail console shows error: Unable to open file. Manually saving gcode and uploading through Mainsail works fine. The same workflow works on OC patched firmware, so this appears Cosmos-specific.

Discord support thread: https://discord.com/channels/1367538416539013122/1530412347250966559 ("steps to revert to stock" — discussion starts in #general 2026-07-24)

Environment

• Printer: Elegoo Centauri Carbon (CC1)
• Firmware: Cosmos (OC patched works fine)
• Slicer: OrcaSlicer — host type octo/klipper, printer agent orca, hostname = printer IP
• Printer was unused for a few weeks before the failure appeared; settings unchanged

Observed behavior

1. Slice in Orca, click Upload and Print.
2. Upload window shows, Mainsail switches to printer tab.
3. File never shows in print jobs.
4. Mainsail console: error: Unable to open file.
5. Manual gcode upload via Mainsail prints normally.

Diagnostic findings so far (from Discord, with @suchmememanyskill)

• ls /user-resource/.tmp → only x/y calibration CSVs; no staged uploads.
• [virtual_sdcard] path: /etc/klipper/gcodes
• Orca upload destination reported by user: /etc/klipper/gcodes
• Uploads claim to land in the same directory klipper reads, yet klipper cannot open the file — suggesting a path/mount mismatch (e.g. /etc/klipper/gcodes on read-only or overlay rootfs) vs the expected /user-resource/gcodes flow.

Still needed from reporter

• moonraker.log captured immediately after a failed upload (requested, not yet provided)
• ls -la /etc/klipper/gcodes after an upload attempt
• Screenshot of the Orca upload dialog (requested, not yet provided)

User's other outstanding questions

• Step-by-step revert-to-stock guide for both OC patched and Cosmos (pointed at docs-site uninstall instructions)
• How to reset moonraker/klipper state via SSH
• Why the same slicer config works on patched but not Cosmos (different stacks — SDCP/Elegoo Link vs moonraker)