G-Shield. Alas, I just don’t have money or sanity to invest in this machine anymore. It doesn’t dip over time like it used too, a problem i had before is that the z-axis would vary the DOF over time, resulting in weird stepping and wavy depth. A new firmware update fixed that.
In this post Surface Milling Aluminum! - #10 by EmilyMaker I detail my success with having my machine eat through aluminum no problem. And that was the case for a good while until recently, where i attempt to cut at any depth and it gets sucked into the material until it stalls.