made 3d printable version of robot chassis

diff --git a/schematic-3d-printable.scad b/schematic-3d-printable.scad
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+// challenge-bot phase-2
+// GNU AGPLv3 (or later at your option)
+// project available at these locations:
+// https://gitorious.org/ozzloy/challenge-bot
+// https://github.com/waynegramlich/challenge-bot
+
+// using
+// https://github.com/josefprusa/Prusa3/blob/master/box_frame/x-carriage.scad
+// as an example of how to code in scad
+
+deck_dimensions = [8, 8, 3/16];
+
+module deck() {
+       cube(deck_dimensions);
+}
+
+module wheel_mount() {
+       difference() {
+               cube([1.5, 2.1, 3/16]);
+               // motor shaft and collar hole
+               translate([0.5, 0.938, -1/16]) {
+                       cylinder(h = 5/16, r = 0.362/2, $fn = 100);
+               }
+               // nubbin hole
+               translate([0.5 + 0.875 - 0.425, 0.938, -1/16]) {
+                       cylinder(h = 5/16, r = 0.145/2, $fn = 100);
+               }
+               // mounting screw hole
+               translate([0.5 + 1.213 - 0.425, 0.938 - 0.687/2, -1/16]) {
+                       cylinder(h = 5/16, r = 0.114/2, $fn = 100);
+               }
+               translate([0.5 + 1.213 - 0.425, 0.938 + 0.687/2, -1/16]) {
+                       cylinder(h = 5/16, r = 0.114/2, $fn = 100);
+               }
+       }
+}
+
+color("blue") deck();
+rotate([90, 0, 0]) translate([1.5, -2, -(3/16)]) wheel_mount();
+rotate([90, 0, 0]) translate([1.5, -2, -8]) wheel_mount();