Twist prototype v1

lib/spoolmount.scad

@@ -3,15 +3,42 @@ use <torus.scad>
 module spoolmount() {
     // Ring
     difference() {
+        // Cylinder body
         cylinder(h=5, r=42, $fn=200);
 
+        // Central through hole
         translate([0, 0, -1])
         cylinder(h=7, r=25, $fn=200);
     }
+    
+    for (a = [45 : 90 : 335]) {
+        // Locking bumps
+        rotate([0, 0, a - 10])
+        rotate_extrude(angle=20, $fn=200)
+        translate([22.5, 0, 0])
+        polygon(points=[
+            [2.5, 0],
+            [0, 2.5],
+            [2.5, 5],
+        ]);
+        
+        // Rounded bump ends
+        for (o = [-10, 10]) {
+            rotate([0, 0, a + o])
+            translate([0, 30, 0])
+            scale([0.2, 1.0, 1.0])
+            rotate_extrude($fn=200)
+            translate([5, 0, 0])
+            polygon(points=[
+                [0, 0],
+                [2.5, 2.5],
+                [0, 5],
+            ]);
+        }
+    }
 
-    // Rounded edges
+    // Rounded outer edge
     translate([0, 0, 2.5]) {
-        torus(r_major=25, r_minor=2.5, xs=0.7, $fn=200);
         torus(r_major=42, r_minor=2.5, xs=0.7, $fn=200);
     }
 }