I've been using this router for over two months now, and I have noticed a weakness or design flaw in the lower y-axis slides! I had made the entire router using IKO LWL12B linear rails, and its obvious now that 12mm is not strong enough for the X & Z-axis weight!
My solution is to remake the lower section and use THK HSR25CR linear slides. These 25mm slides are designed to take force in all directions, and have a nice grease fitting to lubricate them!