diff --git a/case/tt06_demo_base.scad b/case/tt06_demo_base.scad
new file mode 100644
index 0000000..8db816a
--- /dev/null
+++ b/case/tt06_demo_base.scad
@@ -0,0 +1,124 @@
+/* 
+ * Base for Tiny Tapeout 06+ Demoboard
+ *
+ * Design: hxr.social/@thomasflummer
+ *
+ * License: CC-BY-SA
+ *
+ */
+
+/*
+ * Variables for Customizer
+ * ==================================================================
+ *
+ */
+
+// select type of mounting hardware
+Screw_Type = "M2 with insert"; // [M3 direct, M2 with insert]
+
+//-----------------
+/* [AdditionalSettings] */ 
+
+// total height (in mm)
+Height = 8;
+
+module pcb_base(width, length, pcb_thickness, corner_radius, height, mounting_hole_diameter)
+{
+    difference()
+    {
+        union()
+        {
+            hull()
+            {
+                for(x = [-1, 1])
+                {
+                    for(y = [-1, 1])
+                    {
+                        translate([x*(width/2 - corner_radius), y*(length/2 - corner_radius), height/2])
+                            cylinder(r = corner_radius + 2, h = height, center = true, $fn = 150);
+                    }
+                }
+
+                for(x = [-1, 1])
+                {
+                    for(y = [-1, 1])
+                    {
+                        translate([x*(width/2 - corner_radius), y*(length/2 - corner_radius), height/2])
+                            cylinder(r = corner_radius + 2 + 0.5, h = height-1, center = true, $fn = 150);
+                    }
+                }
+            }        
+        }
+        union()
+        {
+            // PCB cutout
+            hull()
+            {
+                for(x = [-1, 1])
+                {
+                    for(y = [-1, 1])
+                    {
+                        translate([x*(width/2 - corner_radius), y*(length/2 - corner_radius), height - pcb_thickness/2])
+                            cylinder(r = corner_radius + 0.4, h = pcb_thickness + 0.01, center = true, $fn = 150);
+                    }
+                }
+            }
+
+            // space for PTH pins and rubber feet
+            hull()
+            {
+                for(x = [-1, 1])
+                {
+                    for(y = [-1, 1])
+                    {
+                        translate([x*(width/2 - corner_radius), y*(length/2 - corner_radius), height/2 + 1.5])
+                            cylinder(r = corner_radius - 1, h = height, center = true, $fn = 150);
+                    }
+                }
+            }
+        }
+    }
+    // studs for screws/inserts
+    
+    for(x = [-1, 1])
+    {
+        for(y = [-1, 1])
+        {
+            if(x == 1 && y == -1)
+            {
+                difference()
+                {
+                    translate([x*(width/2 - 3.5), y*(length/2 - 8), (height - pcb_thickness)/2])
+                        cylinder(d = 6, h = height - pcb_thickness, center = true, $fn = 150);
+
+                    translate([x*(width/2 - 3.5), y*(length/2 - 8), (height - pcb_thickness)/2])
+                        cylinder(d = mounting_hole_diameter, h = height - pcb_thickness + 0.01, center = true, $fn = 150);
+                }
+            }
+            else
+            {
+                difference()
+                {
+                    translate([x*(width/2 - 3.5), y*(length/2 - 3.5), (height - pcb_thickness)/2])
+                        cylinder(d = 6, h = height - pcb_thickness, center = true, $fn = 150);
+
+                    translate([x*(width/2 - 3.5), y*(length/2 - 3.5), (height - pcb_thickness)/2])
+                        cylinder(d = mounting_hole_diameter, h = height - pcb_thickness + 0.01, center = true, $fn = 150);
+                }
+            }
+        }
+    }
+
+    
+}
+
+
+if(Screw_Type == "M2 with insert")
+{
+    pcb_base(99.5, 78, 1.6, 3.0, Height, 3.3);
+}
+
+if(Screw_Type == "M3 direct")
+{
+    pcb_base(99.5, 78, 1.6, 3.0, Height, 2.9);
+}
\ No newline at end of file
diff --git a/case/tt06_demo_base_m2_insert.stl b/case/tt06_demo_base_m2_insert.stl
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diff --git a/case/tt06_demo_base_m3_direct.stl b/case/tt06_demo_base_m3_direct.stl
new file mode 100644
index 0000000..0fab06b
Binary files /dev/null and b/case/tt06_demo_base_m3_direct.stl differ