Translations:Import from STL or OBJ/8/en
Conversion mesh to solid
- Switch to Part Workbench
- Make sure your mesh object is selected in the tree view, otherwise select it
- Choose Part → Create shape from mesh ... from top menu
- Specify tolerance for sewing shape (0,1 is default)
- A new object will be created in the tree view (with blue shape icon, instead of green mesh icon)
- Select the newly created object in the tree view
- Choose Part → Create a copy → Refine shape from the top menu
- A new object will be created in the tree view and the previous one will be made invisible
- Select the newly created object in the tree view
- Choose Part → Convert to solid from the top menu
- A new object will be created in the tree view, bearing "(Solid)" in its name, to indicate it is a solid
Since the created solid has no history and no editable features (like a simple copy in FreeCAD) you could delete all previous objects from the tree view. This would keep your file size small ...