diff --git a/cad/housing.scad b/cad/housing.scad
new file mode 100644
index 0000000..424c853
--- /dev/null
+++ b/cad/housing.scad
@@ -0,0 +1,39 @@
+/////////////////////////////////////////////////////////////////////////////////
+// Housing box for UppSense first tries.
+//
+// Author:              Maximilian Stiefel
+// Last modification:   26.04.3017
+/////////////////////////////////////////////////////////////////////////////////
+
+use <open_box.scad>
+
+/////////////////////////////////////////////////////////////////////////////////
+// Vars
+/////////////////////////////////////////////////////////////////////////////////
+length = 50; 
+width = 80;
+height = 45;
+thickness = 10;
+allowance = 1;
+lid_depth = 5;
+bolt_diameter = 4;
+bolt_spacing = 5;
+my_color = "SteelBlue";
+
+union(){
+	// Using my open box module for creating a simple box 
+	color(my_color, 0.8)
+		open_box(length, width, height, thickness, allowance);
+	// Creating a depening for the lid
+	color(my_color, 0.9)
+	*translate([thickness/2, thickness/2, height])
+		cube([length + 2*allowance + thickness, width + 2*allowance + thickness, lid_depth]);	
+	// Cylindric holes for the PCB
+	*color(my_color, 1.0) translate([0, 0, thickness/2]){
+		translate([thickness + bolt_spacing, bolt_spacing + thickness, 0])
+			cylinder(r=bolt_diameter/2, h=thickness/2+1);
+	}
+	*translate([0,0,0])
+	cube([90, thickness, 50]);
+
+}
diff --git a/cad/open_box.scad b/cad/open_box.scad
index 2df1143..d8b087e 100644
--- a/cad/open_box.scad
+++ b/cad/open_box.scad
@@ -11,27 +11,33 @@ module open_box(width, length, height, thickness, allowance)
 	/////////////////////////////////////////////////////////////////////////
 	// Vars
 	/////////////////////////////////////////////////////////////////////////
-	edge_rounding = 6;
-	compensation = abs(thickness-edge_rounding);
+	edge_rounding = 15;
+	compensation = 2*abs(edge_rounding-thickness);
+	width = width + 2*allowance;
+	length = length + 2*allowance;
 
 	/////////////////////////////////////////////////////////////////////////
 	// Action
 	/////////////////////////////////////////////////////////////////////////
-	difference(){		
+	translate([0, 0, 0]) difference(){		
 		// Hull 4 cylinders which are compensated against the thickness
-		// so the actual desired thickness and edge rounding is always achieved.
+		// so the actual desired thickness/2 and edge rounding is always achieved.
 		hull(){
-			translate([+compensation, +compensation, 0])
+			// x=0, y=0
+			translate([edge_rounding, edge_rounding, 0])
 				cylinder(r = edge_rounding, h = height + thickness);
-			translate([width + 2*allowance + 2*thickness - compensation, compensation, 0])
+			// x=width, y=0
+			translate([width + edge_rounding - compensation, edge_rounding, 0])
 				cylinder(r = edge_rounding, h = height + thickness);
-			translate([compensation, length + 2*allowance + 2*thickness - compensation,0])
+			// x=0, y=length
+			translate([edge_rounding, length + edge_rounding - compensation,0])
 				cylinder(r = edge_rounding, h = height + thickness);
-			translate([width + 2*allowance + 2*thickness - compensation, length + 2*allowance + 2*thickness - compensation,0])
+			//x=width, y=length
+			translate([width + edge_rounding - compensation, length + edge_rounding - compensation,0])
 				cylinder(r = edge_rounding, h = height + thickness);
 		}
 
 		translate([thickness, thickness, thickness])
-			cube([width + 2*allowance, length + 2*allowance, height + 1]);
+			cube([width, length, height + 1]);
 	}
 }