i had thought about them being a little flimsy but then again it's a 15" piece of 50x25x3mm steel box section, not alu extrusion so i dont really know, i would like to think it wouldnt bend but who knows. and for the record it wont be a simple change to strengthen it without making the machine bigger as the ball screw running through the center of the y axis would prevent any support being added between the 2

jazz is currently looking over this for me as i bust my 2 length limit by about 2 meters which i didnt want to do, but it's not the end of the world it's only another £30. however i have a feeling it's all going to change