If you have a simple shape that won't close, you can try the native "Make Face" trick. This is the old-school method that relies on SketchUp’s core geometry engine.
By default, SketchUp creates a face whenever you close a loop of at least that exist on the same flat plane (coplanar). You can trigger this manually by: sketchup make face
: The tool is lightweight, accessible via a single toolbar icon or a right-click context menu. Limitations If you have a simple shape that won't
For complex geometry or imported CAD files with hundreds of lines, manual tracing is too slow. Professional modelers use extensions to automate the process: SketchUp won't create a face where I want it to You can trigger this manually by: : The
Every SketchUp user—whether a seasoned architect or a weekend woodworker—has encountered the same frustrating scenario. You’ve imported a CAD file, or perhaps you’ve been meticulously tracing a floor plan with the Line tool. You close the loop, expecting to see a clean, white (or default blue) surface appear.