Formware Online STL Repair
Free online STL file repair service
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STL tools and resources
A focused list of resources connected to STL. Useful when you already know the kind of problem you are trying to solve and want fewer tabs open.
Tag shelf
A focused list of resources connected to STL. Useful when you already know the kind of problem you are trying to solve and want fewer tabs open.
Free online STL file repair service
Probably the largest free 3D model repository. Owned by UltiMaker.