Parameterize extension and fix > 45deg overhang

extension.scad

@@ -0,0 +1,27 @@
+use <spoolmount_a.scad>
+use <spoolmount_b.scad>
+
+module extension(h=25) {
+    assert(h >= 23, "minimum extension height is 23");
+
+    // Bottom spoolmount
+    spoolmount_b();
+
+    // Top spoolmount
+    translate([0, 0, h - 5])
+    spoolmount_a();
+
+    // Center cylinder
+    cylinder(h=h, r=29, $fn=200);
+
+    // Expansion to support top spoolmount
+    translate([0, 0, h - 18])
+    rotate_extrude($fn=200)
+    polygon(points=[
+        [29, 0],
+        [42, 13],
+        [29, 13],
+    ]);
+}
+
+extension();

extension_15.scad

@@ -1,18 +0,0 @@
-use <spoolmount_a.scad>
-use <spoolmount_b.scad>
-use <torus.scad>
-
-translate([0, 0, 10])
-spoolmount_a();
-
-spoolmount_b();
-
-translate([0, 0, 5])
-difference() {
-    cylinder(h=5, r=42, $fn=500);
-
-    translate([0, 0, -1])
-    cylinder(h=7, r=25, $fn=500);
-    
-    torus(r_major=33.25, r_minor=3.5, ys=1.4, $fn=500);
-}