Sketchup 21.0.0 -

: Faces should only exist on the exterior shell. Any geometry inside the volume will break the solid status.

If you are considering installing or remembering SketchUp 21.0.0, these are the features that set it apart from all previous versions. sketchup 21.0.0

While major updates often bring flashy rendering engines or complex new modeling tools, the release of marked a pivotal shift in the software’s philosophy. Released in early 2021, this version was not about reinventing the geometry engine; it was about refining how designers organize, manage, and live within their models. It was a release focused on the "lifecycle" of a project—from conception to documentation. : Faces should only exist on the exterior shell

: Every edge must be shared by exactly two faces. Sharing an edge with three or more faces creates a "non-manifold" error. Tools to Fix Non-Solid Objects While major updates often bring flashy rendering engines