Been working on this for a while now. Still (and probably always will be) clunky, but I think it's at a point where it might be useful to other folks. On GitHub: https://github.com/WillAdams/gcodepreview and I've been writing about it a bit at: https://forum.makerforums.info/ Basically you work up a file: include <C:/Users/willa/OneDrive/Documents/RapCAD/Libraries/gcodepreview.scad> stocklength = 125; stockwidth = 75; stockthickness = 6.35; toolradius = 1.5875; zeroheight = "Bottom"; // [Top, Bottom] stockorigin = "Center"; // [Lower-Left, Center-Left, Top-Left, Center] generategcode = false; retractheight = 3; feedrate = 850; plungerate = 425; //add stockthickness if zeroheight = Bottom safetyheight = retractheight; // + stockthickness; difference() { setupcut(stocklength, stockwidth, stockthickness, zeroheight, stockorigin); toolchange(102); startspindle (17000); writecomment("PREPOSITION FOR RAPID PLUNGE"); rapid(0,0,safetyheight * 2,0,0,safetyheight); plungegcutretract(0, 0, 0, 0, 0, -stockthickness, 102, retractheight, plungerate, feedrate); } closecut(); which previews as expected (see images on the forum link) Once a design is done it can be transferred into RapCAD, or just processed in that on the command line: C:\Progra~1\RapCAD\rapcad.exe  gcode.rcad -o null -r rcadgcode.nc to get a G-code file: (STOCK/BLOCK,  125 ,  75 ,  6.35 ,  62.5 ,  37.5 , 0.00) G90 G21 (Move to safe Z to avoid workholding) G53G0Z-5.000 M05 (TOOL/MILL,3.17, 0.00, 0.00, 0.00) M6T102 M03S17000 ( PREPOSITION FOR RAPID PLUNGE ) G0 X 0  Y 0 Z 3 G0 X 0  Y 0 Z 3 G1 X 0  Y 0 Z 0 F 425 G1 X 0  Y 0 Z -6.35 F 850 G0 X 0  Y 0 Z 3 M02 which will make the specified cuts on a CNC machine. Next up is doing some interesting joinery which actually justifies all this. At some point I'd like to get this into OpenSCAD Graph Editor or some similar tool, ideally w/ support for the Customizer. If someone doing one of the other interact/node/graph interfaces could make use of it, I'd be gratified and interested. William