If you prefer not to use plugins, you can manually bevel edges using the tool:
A newer, dedicated tool that focuses on ease of use and "non-destructive" modeling. Bevel - SketchUp Extension Warehouse
[Insert download link]
: Note that newer versions of Fredo6 plugins are now paid, but older versions found on SketchUcation may still be available.
Instead of drawing an arc on every corner and erasing the line, you simply select the edge, type in a radius, and hit enter. It handles complex corners (like three-way intersections) perfectly.
If you prefer not to use plugins, you can manually bevel edges using the tool:
A newer, dedicated tool that focuses on ease of use and "non-destructive" modeling. Bevel - SketchUp Extension Warehouse
[Insert download link]
: Note that newer versions of Fredo6 plugins are now paid, but older versions found on SketchUcation may still be available.
Instead of drawing an arc on every corner and erasing the line, you simply select the edge, type in a radius, and hit enter. It handles complex corners (like three-way intersections) perfectly.