My MK Diamond 101 tile saw was designed for smaller tile than is common today.  These supports fit into the holes on the table and lift the work area to level with the back fence so you can work with larger format (12x24 in the picture) tile that is common today.  The "correct" method would be to get a bigger saw, but that's not always an option, hence the supports.  If you've laid enough tile, you'll understand that tile is not wood and this method can work fairly well.  I thought this design was too simple and obvious to upload, and then I thought better of it.  Sometimes obvious doesn't happen.   MK still uses the diamond hole in their saw beds today.  I don't know if its the same as my old 101, but the openscad file is parameterized and commented if you need to make adjustments.