Spaced internal shells or Walls with configurable air gap #1508

New Issue

MrUnknownDE · 2026-04-05T18:06:49+02:00

MrUnknownDE commented

2026-04-05 18:06:49 +02:00

Originally created by @Quadra600 on 11/26/2025

Is there an existing issue for this feature request?

I have searched the existing issues

Hi team and thank you for the incredible work on OrcaSlicer!

Use case
Many users who print lightweight yet extremely rigid parts (drone frames, RC components, robotic arms, cylindrical/tubular structural parts) need the following wall structure:

2–4 normal external perimeters (solid and touching each other)
A user-configurable empty gap / air gap (typically 0.5 mm to 4 mm)
1–3 internal concentric shells/perimeters perfectly detached from the external walls
The very inside can stay hollow or use any classic infill pattern
Automatic radial spokes/connectors placed in the gap every N layers (the existing “Connect infill lines” + “Gap fill” already does this beautifully when infill is detached)

This structure creates an ultra-rigid “double-wall with air gap” that is vastly stronger and lighter than solid walls or normal infill.

Current workarounds (both painful)

Very low-density concentric infill + 0 % overlap → gap exists but is not precisely controllable and varies with model size
Scaled/shifted cylinder modifier with 100 % concentric infill → works perfectly but is slow and basically unusable on complex or multi-body geometries

Which printers will be beneficial to this feature?

All

Describe the solution you'd like

It would be amazing to have a small dedicated section (e.g. under Print Settings → Walls → Advanced) with just a few settings:

Enable spaced internal shells
External perimeters: ______ (default = current perimeter count)
Air gap width: ___ mm
Internal concentric shells: 0–3
Infill inside internal shells: (standard infill dropdown or 0 %)
Radial connectors every ___ layers (or “Auto” using current logic)

With this single feature OrcaSlicer would instantly become the best slicer on the market for ultra-lightweight structural parts.

Thank you so much for considering this!
It would be a game-changer for hundreds of makers.

Describe alternatives you've considered

No response

Additional context

No response

*Originally created by @Quadra600 on 11/26/2025* ### Is there an existing issue for this feature request? - [x] I have searched the existing issues ### Is your feature request related to a problem? Hi team and thank you for the incredible work on OrcaSlicer! **Use case** Many users who print lightweight yet extremely rigid parts (drone frames, RC components, robotic arms, cylindrical/tubular structural parts) need the following wall structure: - 2–4 normal external perimeters (solid and touching each other) - A user-configurable empty gap / air gap (typically 0.5 mm to 4 mm) - 1–3 internal concentric shells/perimeters perfectly detached from the external walls - The very inside can stay hollow or use any classic infill pattern - Automatic radial spokes/connectors placed in the gap every N layers (the existing “Connect infill lines” + “Gap fill” already does this beautifully when infill is detached) This structure creates an ultra-rigid “double-wall with air gap” that is vastly stronger and lighter than solid walls or normal infill. **Current workarounds (both painful)** 1. Very low-density concentric infill + 0 % overlap → gap exists but is not precisely controllable and varies with model size 2. Scaled/shifted cylinder modifier with 100 % concentric infill → works perfectly but is slow and basically unusable on complex or multi-body geometries ### Which printers will be beneficial to this feature? All ### Describe the solution you'd like It would be amazing to have a small dedicated section (e.g. under Print Settings → Walls → Advanced) with just a few settings: - Enable spaced internal shells - External perimeters: ______ (default = current perimeter count) - Air gap width: ___ mm - Internal concentric shells: 0–3 - Infill inside internal shells: (standard infill dropdown or 0 %) - Radial connectors every ___ layers (or “Auto” using current logic) With this single feature OrcaSlicer would instantly become the best slicer on the market for ultra-lightweight structural parts. Thank you so much for considering this! It would be a game-changer for hundreds of makers. ### Describe alternatives you've considered _No response_ ### Additional context _No response_

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Reference: github/OrcaSlicer#1508