To add realism to your SketchUp models, perfectly sharp 90-degree edges must be avoided, as real-world objects always have some degree of roundedness or "bevel." While SketchUp's native tools can be tedious for this task, several plugins automate the process.
When searching for a for SketchUp, be careful: many plugins are "freemium" (free trial, then pay). Below are the three best genuinely free or with robust free tiers available right now. bevel plugin sketchup free download