I prefer something other than checkmarks for the two center buttons, so I made a circle with a slash through it for the button Jetty referred to originally as a zero and I made an "enterf" icon based on my laptop enter key. The OpenSCAD code is with this to modify as you want.I tried printing this as Emmett said with 0 shells and 0 Infil Perimeter Overlap, but the "No" symbol (the circle with a slash) would not fill correctly. In the photo showing all the attempts, this is seen in the two or three in the front. I successfully printed the final saetwith 100% Infill, 1 extra shell, and 0.10 Infill Perimeter Overlap Ratio.To get the two-colors, I used Jetty's Gen4 Interface code and stopped at a Z-position of +.84, because I am printing at a layer height of 0.28.As you can see, it took a lot of triesa. The final is not quite perfect ... I probably could have pushed it dowm on the platform a bit more to fill the top (bottom when printing) but I can use these.