Hi guys, I'm just about to finish the mechanical bit of my XLarge and as I went along I noticed some things I would like to upgrade, like switching the two 20x60x500 to c-beams for 20mm more Z -height, and build a table from 20x80 v-slot instead of MDF. However, my main issue is the deflection on Z/X. This is me pressing on top of the spindle motor, I've been thinking about how to stiffen the X C-beam without changing the gantrys, but nothing really makes sense. I saw one build in the gallery that uses double c-beams joined together, but that means you have to extend the screws for the wheels (using threaded rods instead) and that creates new problems like mounting the Z-gantry. There is some space on the "inside" of the c-beam to add material, like L-shaped stainless steel or U-shaped aluminum. But the maximum material thickness is about 3mm to clear the acme blocks. Is that really going to make any difference? Any ideas out there?