This was designed to support the electrical conduit between the corners. Making a CNC Machine longer in the Y direction, like a machine that could handle a 4' (1219mm) x 8' (2438mm) work piece, some sort of support would be needed. All holes are 8mm, this size, when I print them on my printer, works great for .25 in threaded rod or bolts. There are 2 designs included. One is designed around using conduit, like is used on the corners and one is designed to use threaded rod. I have printed both styles and they print well, but I have not tried either yet because my machine is not built to a point that they could be tested.
Update: Included a nut trap that slips on to a .25in. dowel for alignment. After the threads are started you can pull the dowel out.
Update-added a nut trap for 25mm conduit.
Flashforge Creator Original Duel