How to Remove a Hole in FreeCAD
If you have an existing solid with a hole that you want to remove, you can use FreeCAD's Defeaturing tool. This is especially useful when working with imported models where you don't have the original feature history. The process is straightforward. Select the cylindrical face of the hole and let FreeCAD remove the feature and close the opening. Switch to the Part workbench. Select the cylindrical face of the hole — not the circular edge. Go to Part → Defeaturing . Apply the operation. FreeCAD will remove the hole and close the resulting opening.