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The buildplate meshes can be in .3mf format. When Cura is loading a printer, it may try to load its mesh from a 3mf file. At the moment cura is starting up there is no build volume yet, so adding a convexHull to the printer's 3mf buildplate mesh is not possible. By surrounding the addition of the convexHull with a try-except, loading of 3mf buildplate meshes on startup doesn't cause issues. Fixes https://github.com/Ultimaker/Cura/issues/8585