**System Information**
Operating system: Windows 10
Graphics card: ?
**Blender Version**
Broken: 3.0.1
Worked: ?
**Short description of error**
Export an Objekt as a STL File. Then open that File with Cura (Slicer-Program for 3D-Printing). Cura reports, that there are missing Surfaces.
**Exact steps for others to reproduce the error**
Make an komplex Object. Export it as a STL File. Open Cura. Load the STL File. Much of the Surface of the object is red. And Cura reports the Error by a Window.
So, it is not possible to 3D-print an object, constructed by belnder 3.0.1 :( {F12842128}