Document how to build

README.md

@@ -13,6 +13,18 @@ the back doesn't.
 So you can use them for games that need some sort of coin with two sides.
 
 
+# How To Build
+
+Load [chip.scad](chip.scad) in OpenSCAD.
+In the menu, select "View" then "Customizer".
+Click the "Parameters" collapsed item in the new pane,
+and put in whatever values you want.
+
+When you're ready to make a `.stl` file,
+click the "Render" button,
+then "Export as STL".
+
+
 # Chip Colors
 
 This is what I found on some random crafting web site.