Another bed mount for BLV mgn cube

This is another mount for the z carriage of BLV mgn cube.

It is not the easiest to install, but it is single piece, so perhaps more rigid than others. Still, it does not make the bed perfectly stable.

It is modeled for 8mm m4 screws and 12mm m3 screws, because that is what I had on hand. I include FreeCAD source and step files, so it should be easy to modify.