more designs

pencil_hanger.scad

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+inner_dia = 17;
+thickness = 1.6;
+outer_dia = inner_dia + 2*thickness;
+
+module ring(){
+    translate([0,-outer_dia/2,0])
+    linear_extrude(height=2)
+    difference(){
+        union(){
+            circle(r=inner_dia/2+thickness);
+            translate([-outer_dia/2,0,0])
+            square(size=[outer_dia, outer_dia/2], center=false);
+        }
+        circle(r=inner_dia/2);
+
+        squ_height = 15;
+        translate([0,-squ_height/2,0])
+        square(size=[inner_dia-thickness, squ_height], center=true);
+    }
+}
+
+union(){
+    ring();
+    translate([0,thickness/2,0])
+    cube(size=[outer_dia, thickness, outer_dia], center=true);
+}