Simple case for AVR ESR meter

ESR Meter/esr-case.scad

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+width = 67;
+height = 67.5;
+hole_nub = 5;
+hole = 2;
+hole_width = 60;
+hole_height = 40;
+hole_offset_top = 3;
+wall_size = 1.4;
+
+depth_top = 3.6;
+depth_pcb = 1.6;
+depth_bottom = 4.1;
+depth_gap = 0.4;
+depth = depth_top + depth_pcb + depth_bottom + depth_gap;
+screw_nub_depth = depth_bottom + depth_gap;
+
+$fn = 20;
+
+module nub() {
+    difference() {
+        cylinder(d = hole_nub, h = screw_nub_depth);
+        translate([0, 0, -1])
+            cylinder(d = hole, h = screw_nub_depth + 2);
+    }
+}
+
+module nubs() {
+    nub();
+    
+    translate([hole_width, 0, 0])
+        nub();
+    
+    translate([0, hole_height, 0])
+        nub();
+    
+    translate([hole_width, hole_height, 0])
+        nub();
+}
+
+// base
+cube([width + (2 * wall_size), height + (2 * wall_size), wall_size]);
+
+// left wall
+difference() {
+    translate([0, 0, wall_size])
+        cube([wall_size, height + (2 * wall_size), depth]);
+    
+    translate([-1, wall_size + height - hole_offset_top - hole_height + hole_nub, wall_size])
+        cube([wall_size + 2, hole_nub, hole]);
+}
+
+// bottom wall
+translate([0, 0, wall_size])
+    cube([width + (2 * wall_size), wall_size, depth]);
+
+// right wall
+translate([width + wall_size, 0, wall_size])
+    cube([wall_size, height + (2 * wall_size), depth]);
+
+// top wall
+translate([0, height + wall_size, wall_size])
+    cube([width + (2 * wall_size), wall_size, depth]);
+
+translate([wall_size + (width - hole_width) / 2, wall_size + height - hole_height - hole_offset_top, wall_size])
+    nubs();