Scale settings for exporting to STL (for 3d printing) I've set my Units (in scene properties) to Metric, and the Scene Scale to 0.01 hoping to get the Blender dimensions it mm's. While the (normal) scale is 1 for x,y,z, the standard cube has the dimensions 2x2x2 cm. When I export this to an STL and open it in a slicing program (Netfabb, Slic3r or Cura) they all give the dimensions: 2x2x2 mm. While exporting, the scale is 1.

What am I doing wrong? I hope you can help me.

Thanks!
The STL exporter doesn't take Scene Scale into account. Import your STL back into Blender (it will have the same size) and drag Scene Scale up back to 1.0, and you'll see how the cube grows relative to the grid.

1 Blender unit equals 1m, but STL seems to assume 1 unit as 1cm.

If you want 1 unit to be 1mm, set Scale on STL export to 0.1 and Scene Scale to 0.001 to make it match the output scale in viewport.

Note that the STL will be 10x smaller if you re-import it into Blender!