stdin.diff

--- skateboard-box.scad	2014-06-05 18:53:05.207198653 -0700
+++ -	2014-06-05 18:53:49.918846203 -0700
@@ -1,6 +1,7 @@
 // All measurements are made in millimeters
 
 $fs=2; // Sphere polygons
+fudge=0.01;
 
 // Skateboard enclosure
 difference() {
@@ -58,7 +59,8 @@
 	union() {
 		difference() {
 			cube([x, y, z], center=true);
-			cube([x-wallwidth, y-wallwidth, z], center=true);
+                        translate([0, 0, fudge])
+                            cube([x-wallwidth, y-wallwidth, z+fudge], center=true);
 		};
 		translate([0, 0, z * -0.5]) {
 			cube([x, y, wallwidth], center=true);