diff --git a/geeboard_case/geeboard_case.scad b/geeboard_case/geeboard_case.scad
new file mode 100644
index 0000000..c817e67
--- /dev/null
+++ b/geeboard_case/geeboard_case.scad
@@ -0,0 +1,30 @@
+module rounded_square(dimensions, radius, center=true) {
+  minkowski(){
+    square(dimensions - 2 * [radius,radius], center=center);
+    circle(radius);
+  }
+}
+
+CASE_WIDTH = 245;
+CASE_HEIGHT = 92;
+CASE_THICKNESS = 6.0;
+SCREW_DIAMETER = 3.0;
+SCREW_OFFSET = 4;
+// solution and simplification of 
+// 2*(INNER_RADIUS+CASE_THICKNESS)^2 = (INNER_RADIUS+OUTER_RADIUS+sqrt(2 * SCREW_OFFSET ^ 2))^2
+// INNER_RADIUS = sqrt(2) * (2 * SCREW_OFFSET - CASE_THICKNESS) + 3 * SCREW_OFFSET - 2 * CASE_THICKNESS;
+INNER_RADIUS = (2 + sqrt(2)) * (2 * SCREW_OFFSET - CASE_THICKNESS) - SCREW_OFFSET;
+
+echo("INNER_RADIUS=", INNER_RADIUS);
+
+
+difference() {
+
+  rounded_square([245,92], SCREW_OFFSET);
+  translate([+(CASE_WIDTH/2 - SCREW_OFFSET), +(CASE_HEIGHT/2 - SCREW_OFFSET)]) circle(SCREW_DIAMETER / 2);
+  translate([+(CASE_WIDTH/2 - SCREW_OFFSET), -(CASE_HEIGHT/2 - SCREW_OFFSET)]) circle(SCREW_DIAMETER / 2);
+  translate([-(CASE_WIDTH/2 - SCREW_OFFSET), +(CASE_HEIGHT/2 - SCREW_OFFSET)]) circle(SCREW_DIAMETER / 2);
+  translate([-(CASE_WIDTH/2 - SCREW_OFFSET), -(CASE_HEIGHT/2 - SCREW_OFFSET)]) circle(SCREW_DIAMETER / 2);
+  rounded_square([245 - 2 * CASE_THICKNESS,92 - 2 * CASE_THICKNESS], INNER_RADIUS);
+}
+