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Parametric Solid

In one sentence: Creates a closed solid from a set of selected surfaces (shells) — the parametric equivalent of Part's "Convert to Solid".

Third-party addon — installation required

The Curves workbench is not included in FreeCAD. Install it via Tools → Addon Manager → search "Curves" → Install and restart FreeCAD.

Overview

Workbench: Curves
Menu: Misc. → Parametric Solid
Command: solid

The selected faces must form a closed, watertight shell. The result is a Part::Feature solid that updates if the source surfaces change — unlike Part's Convert to Solid which produces a static result.

See also