Hi all, new to the forum and happy to be here! I'm working on my second CNC, had to leave the first at my parent's when I moved country for work. It was a Root 3 CNC (Root 3 CNC multitool router 3D printed parts by sailorpete) and while not the best build, with a good number of design flaws, I noted that it used a total of 4x 2020 extrusions and I saw no real issues with sagging or dipping, suggesting to me that for the light milling I intended, it was strong enough. It cut 750x1000mm Now, my new CNC is meant to be a light 400W indoor build (as I live in a block of flats and don't want to drive my neighbours insane) with an enclosure and such, and meant to mill just wood, plastic and ply. I just wanted some advice/reassurance about using 2020 v-slot in the X axis. I plan to use 3 lengths at ~750mm long, two of which are vertically aligned and which the Z gantry runs along, the third is offset backwards in order to add more rigidity but isn't used for motion. I'm planning to get the gantry plates milled out of 6mm aluminium so you can understand why I want to be quite sure before I order them up, but for the same reason I should have decent strength/rigidity:mass. The extrusions would be bolted through into the centre and with multiple right angle braces around them. I also plan to use xtreme mini wheels. The other option I'm considering is 2x 4040 instead, no third brace. I'm attaching a screenshot of the assembly so far. As you can see they're a good 175mm apart so my lever arm is nice and long, plus I'm quite happy with the loading. I'm kind of just looking for some reassurance from the more experienced! Thoughts, anecdotal tales and advice welcome, thanks!