: When extruding a closed curve (like a circle or square), ensure the Solid=Yes option is selected in the command line to create caps at both ends. Verification Tools

To "put together a solid" in , you typically use commands that convert open surfaces or curves into a closed, manifold volume. A solid in Rhino is defined as a polysurface that completely encloses a volume of space with no "naked edges." Core Commands to Create Solids

: Run this and select Naked Edges . If any edges highlight in magenta, your object is not yet a solid and has gaps that need to be closed.

Version is a specific Service Release Candidate (RC). While it includes standard bug fixes and stability improvements, the fundamental solid-modeling engine remains consistent with the main Rhino 7 documentation. Create a Solid with Rhino 7 or 8

To ensure your feature is truly "solid" (water-tight for 3D printing or boolean operations):

: Select your object; the type should read "closed solid polysurface." Specific Version Note

: Select a group of intersecting surfaces or polysurfaces that "box in" a volume. Rhino will trim the excess and join the pieces into a single closed solid.

: If you have a planar opening (a flat hole) in a polysurface, the Cap command will create a flat surface to seal it and turn it into a solid.

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