Use this if your SketchUp 8 has the button. Download the .rbz file from the SketchUp-STL GitHub.
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If you do not see an "Install Extension" button, you must manually move the files: SketchUp STL Use this if your SketchUp 8 has the button
The is a bridge between a beloved legacy tool and modern additive manufacturing. When installed correctly, it works reliably—provided your model is watertight. sketchup 8 stl plugin download