Hi Sebastian,


> Aah, alright, I get it. So there's no special command, but
> joining all the sufaces will do that.

Yup!


> I just had a look into my file, and it was already a solid. So
> this "degeneratd face" thingy probably was just something
> to omit or I picked some mesh settings that were too coarse.

Yeah, you don't want to go too overboard with making a hugely dense mesh - but at the same time you don't want to be too stingy with too rough of one either.

When you save to a mesh format, there is a readout of the polygon count in the upper right area of the main window, here:



You only really need to get concerned about being too large in file size once that goes up over something like 100,000 faces.

On the other hand, you actually don't want to generate polygons that are extremely teeny tiny in size because the receiving application may decide to do stuff like fuse together vertices that are quite close to one another.

- Michael