Got some of my electronics for the Spider I am building, been playing with firmware and icons on this touch screen. I sure wished that Makerbase would release source code. But alas that is likely never going to happen. So I can only change a very few things that a HEX editor will allow me to do without breaking the current firmware.
All the icons I used were stolen from the web and put in a very large (lots of layers) PSD file, I just pick the image layer I want, select the text layer that goes with it, then “Save as …” to get the correct icon I need. Willing to share the PSD for those tempted to try the MKS-TFT