Moving objects to another layer

Wonder if that is the problem with a 4 leaf clover I got from the wearhouse . . when I exported it to .STL file it just went to a 1 k file opened or tired to in Slic3r and it said EMPTY FILE nothing in it, . . as the sketchup file it was 499 k and like 5 foot 9 inches across ! . . I use Tape measure to check it in Sketchup . . What happened to the file . . Thinking of going to Blender and see what happens with files