Hi I started machining more aluminium and I need more rigidity. I also started to make more complicated things where I need accuracy and tight tolerances. I have xl version but smaller; around 320x280. Im going to add 2 v slots on both sides to support X axis. Replace 90 degree brackets to gain more in X. Ive noticed that its easy to move the Z gantry down by pulling. What can I do with it? Is it worth adding two extra wheels to Y and X? I recently replaced mdf wasteboard with 12mm aluminium. It turned to be a good idea. Unfortunately the sides are still bad, therfore Im going to add supports. Do you recommend vslots plus wheels or sbr? Is it better to extend X or Y? Will I loose much if i make it longer in Y? Im considering increasing Z by 4 or 5cm. Im not sure if im trading too much for that extra depth. I wanted to put all the improvement ideas for cb xl in one place. I need some now and I wanted to plan upgrades for the future.