Odd issue, but for some reason, my printer or sketchup can not handle the number 4 for 3d text. In sketchup, the number are perfect, no extra faces, they are a solid. I use export stl from extension warehouse. My 3d printer software opens it with no issues. it looks just fine in the software. i hit print, it can print any number but the number 4. It makes a single layer and then does not add upon it. so strange.
here are some pics of it. I have also attached the SU file. When i sliced it, i noticed that the number 4 had only 2 layers while the others had 4.
5_8in 3_4in.skp (194.9 KB)
The above is in my printing software. so it shows up nice.