Support overhang threshold angle (support_angle)

Overhangs flatter than this angle, measured from the horizontal, get support, in degrees. Higher values add support to steeper faces; 0 leaves the choice to the slicer. Declared ranges cover 0 to 90°.

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.

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 support_material_threshold, support_threshold_angle and support_angle, 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.

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.

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

The slicers disagree on the type: Cura as float, PrusaSlicer, Bambu Studio, OrcaSlicer and Creality Print as int. 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 support overhang threshold angle under its own name alongside the rest of the print settings. The file stays in your browser; see what leaves it.