You can try software like Wings 3D, Autodesk Meshmixer, or MeshLab as these let you open, view, and modify an STL file. If you want to use an online tool, use free web services like 3D Slash or ...

If you need to modify the STL model, you can do so using its several designing tools. Furthermore, it lets you convert STL to other 3D files like GLB, FBX, 3MF.

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STL files are everywhere. When there’s something to 3D print, it’s probably going to be an STL. Which, as long as the model is good just as it is, is no trouble at all. But sooner or la… ...