Inner wall line width (inner_wall_line_width)

Inner wall line width is a number in mm. Line width of inner wall.

What does each slicer call it?

Five slicers, five spellings of one setting. The scope column is which preset the key belongs to, which is what decides whether changing it follows the printer, the filament, or the print profile.

Slicer	Key	Scope
PrusaSlicer	`perimeter_extrusion_width`	process
Bambu Studio	`inner_wall_line_width`	process
OrcaSlicer	`inner_wall_line_width`	process
Cura	`wall_line_width_x`	process
Creality Print	`inner_wall_line_width`	process

Where does it live in the file?

All five slicers file this under the process preset, so its value follows the print profile rather than the model. A .3mf is a zip, so unzip it and search for perimeter_extrusion_width, inner_wall_line_width and wall_line_width_x, or open the file in preslice and read the Raw tab, which searches every member at once.

Four of the five slicers write their settings into a sidecar part beside the geometry. Cura writes them into the model XML itself, so there is no config part to open.

Slicer	Part	Format
PrusaSlicer	`Metadata/Slic3r_PE.config`	INI, one `key = value` per line
Bambu Studio	`Metadata/project_settings.config`	JSON, one flat object
OrcaSlicer	`Metadata/project_settings.config`	JSON, one flat object
Cura	`3D/3dmodel.model`	XML metadata inside the model part, under a `cura` namespace
Creality Print	`Metadata/project_settings.config`	JSON, one flat object

What values are valid?

Each slicer declares its own type, default, and bounds for its key. They do not always agree, and where they disagree the file is still valid in both: the slicer that wrote it is the one that enforced its own rule.

Slicer	Type	Unit	Default	Range
PrusaSlicer	float	mm or %	`0.25`	`0` or more
Bambu Studio	float	mm	`0.45`	`0` or more
OrcaSlicer	floatOrPercent	mm or %	`0.45`	`0` to `1000`
Cura	float	mm	`0.4`	not declared
Creality Print	float	mm or %	`0.45`	`0` to `1000`

Cura declares no range for this key, so nothing in the file bounds it.

The slicers disagree on the type: PrusaSlicer, Bambu Studio, Cura and Creality Print as float, OrcaSlicer as floatOrPercent. preslice reads all of them.

Every type, default, and bound above is read from the slicer's own field definitions rather than from measurement: PrusaSlicer's PrintConfig.cpp, Bambu Studio's PrintConfig.cpp, OrcaSlicer's PrintConfig.cpp, Cura's fdmprinter.def.json and Creality Print's PrintConfig.cpp.

Can I read it from my own file?

Yes, without installing a slicer. Open preslice and drop a .3mf on the page. It unzips and parses the file in your browser, and shows inner wall line width under its own name alongside the rest of the print settings. The file never leaves your machine, and nothing uploads.