I get this error code about 1 in 10 times when saving 3D models in MS 3D Builder (.3mf file format). message reads "Couldn't export that. Please try again. Error code: 0x80004005". Trying aga yeild the same result. I can Save As .stl, or .obj successfully, but not always .3mf. This can be very frustrating when working on complex models over a number of days, when despite frequent back-ups, work can be lost.\n\nNote that the problem does occur with any consistency - it's about 1 in 10, but once it has happened for a particular file it sticks. Oh, and it also 'overwrites' the previous file of the same name - making the new one 0bytes before declaring it can't be saved.\n\nAny ideas, anyone?