I noticed some flex in my CNC while I was doing some aluminum test cuts, and I especially noticed when I was milling some 3D parts. I replaced the Z-Axis thinking that would solve my troubles, however after analysis of the machine I came to the conclusion that the X-Axis was the problem. I have already invested a decent amount of money into this machine, being my first machine, and I'm fairly new to the CNC world. In order to increase the rigidity of the machine I figured that the X-Axis should be replaced. The design calls for 2 C-Beam extrusions, with one being a linear actuator. My Y-Axis is already fairly stiff and should not be a problem. My question is how rigid are the C-Beams , and if my design is capable of milling aluminum without taking a million little passes. Edit: I should also mention that my design only consists of the new X-Axis design, the original X-Gantry plates will replaced with new ones that extend to both of the makerslide rails on the Y-Axis, and they are held together by 8 V-Wheels. Specifications: Spindle: Dewalt 611 22k-30k rpm Machine Size: 750x1000mm Stepper Motors: Nema 23 140oz Post 2016 model machine (Gen 2 X-Carve). Upgrades: New 10" Z-Axis T Slot Bed Raised Y-Gantry plates Extra Y-Axis Rails Any help is appreciated. Do note that I am new to the forums, and to CNC work in general.