add bend_extrude

src/bend_extrude.scad

@@ -0,0 +1,32 @@
+module bend_extrude(size, angle, frags = 24) {
+    x = size[0];
+    y = size[1];
+    z = size[2];
+    frag_width = x / frags ;
+    frag_angle = angle / frags;
+    half_frag_width = 0.5 * frag_width;
+    half_frag_angle = 0.5 * frag_angle;
+    r = half_frag_width / sin(half_frag_angle);
+    s =  (r - z) / r;
+    
+    module get_frag(i) {
+        offsetX = i * frag_width;
+        linear_extrude(z, scale = [s, 1]) 
+            translate([-offsetX - half_frag_width, 0, 0]) 
+                intersection() {
+                    children();
+                    translate([offsetX, 0, 0]) 
+                        square([frag_width, y]);
+                }
+    }
+
+    offsetX = -r * cos(half_frag_angle) ;
+    for(i = [0 : frags - 1]) {
+       rotate(i * frag_angle + half_frag_angle) 
+            translate([0, offsetX, 0])
+                rotate([-90, 0, 0]) 
+                    get_frag(i) 
+                        children();  
+    }
+
+}