Which one? The one I'm gathering parts for right now. Hoping to make a 4' wide by 8' high vertical machine because of limited floor space. Right now, electronics are being stockpiled so I can finish the hard part. A pair of 1600oz NEMA 34's motors will run the "Y", so a counterweight 'solution' shouldn't be needed...or so I'm guestimating. Soon as the doors can be propped open and the garage emptied into the driveway, we can start on the welding of the frame. So...the one I'm building right now is the one I'd use it on.