initial coupler

coupling.scad

@@ -0,0 +1,28 @@
+q = 100;
+hole_angle = 27;
+inner_height = 18;
+
+difference(){
+union(){
+    linear_extrude(height=2.5){
+        difference(){
+            circle(d=25, $fn=q);
+            circle(d=12.5, $fn=q);
+        };   
+    }
+
+//    linear_extrude(height=18){
+    linear_extrude(height=inner_height){
+        difference(){
+            circle(d=20, $fn=q);
+            circle(d=14.5, $fn=6);
+        };   
+    }
+}
+
+rotate([0, 90, hole_angle]){
+    translate([-5,0,-12.5]){
+        cylinder(25, 5/2, 5/2, $fn=q);
+    }
+}
+}