Unfolding in Sketchup free version manually - PaperModelers.com
Best plugin or component for unfolding surfaces / closed meshed - Grasshopper - McNeel Forum
GitHub - alexschreyer/SketchUp-Flatten-Plugin: Allows the user to unfold and lay arbitrarily-oriented faces flat on the ground. This helps in producing cutouts, as CNC-prep etc.
Sketchup Unfold Tool - Extensions - SketchUp Community
Unwrapping and unfolding correctly in SketchUp • [as]