diff --git a/src/path_extrude.scad b/src/path_extrude.scad
index 2999eb0a..689fa8a6 100644
--- a/src/path_extrude.scad
+++ b/src/path_extrude.scad
@@ -18,7 +18,6 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
     len_path_pts = len(pth_pts);
     len_path_pts_minus_one = len_path_pts - 1;
     
-
     module axis_angle_path_extrude() {
         twist_step_a = twist / len_path_pts;
 
@@ -47,16 +46,16 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
         // get rotation matrice for sections
 
         function local_ang_vects(j) = 
-            j == 0 ? [] : local_ang_vects_sub(j);
-        
-        function local_ang_vects_sub(j) =
-            let(
-                vt0 = pth_pts[j] - pth_pts[j - 1],
-                vt1 = pth_pts[j + 1] - pth_pts[j],
-                a = acos((vt0 * vt1) / (norm(vt0) * norm(vt1))),
-                v = cross(vt0, vt1)
-            )
-            concat([[a, v]], local_ang_vects(j - 1));
+            [
+                for(i = j; i > 0; i = i - 1) 
+                let(
+                    vt0 = pth_pts[i] - pth_pts[i - 1],
+                    vt1 = pth_pts[i + 1] - pth_pts[i],
+                    a = acos((vt0 * vt1) / (norm(vt0) * norm(vt1))),
+                    v = cross(vt0, vt1)
+                )
+                [a, v]
+            ];
 
         rot_matrice = [
             for(ang_vect = local_ang_vects(len_path_pts - 2)) 
@@ -132,27 +131,25 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
             let(
                 fst_section = 
                     translate_pts(local_rotate_section(0, 0, [1, 1, 1]), pth_pts[0]),
+                end_i = len_path_pts - 1,
                 remain_sections = [
-                    for(i = [0:len_path_pts - 2]) 
-                    
+                    for(i = 0; i < end_i; i = i + 1) 
                         translate_pts(
                             local_rotate_section(i, i * twist_step_a, [1, 1, 1] + scale_step_vt * i),
                             pth_pts[i + 1]
                         )
-                    
-                        
                 ]
             ) concat([fst_section], remain_sections);
         
         sects = sections();
 
-        function calculated_sections() =
+        calculated_sections =
             closed && pth_pts[0] == pth_pts[len_path_pts_minus_one] ?
                 concat(sects, [sects[0]]) : // round-robin
                 sects;
         
         polysections(
-            calculated_sections(),
+            calculated_sections,
             triangles = triangles
         );   
 
@@ -187,28 +184,24 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
                     ) + p1
             ];
         
-        function path_extrude_inner(index) =
-        index == len_path_pts ? [] :
-            concat(
-                [section(pth_pts[index - 1], pth_pts[index],  index)],
-                path_extrude_inner(index + 1)
-            );
+        path_extrude_inner =
+            [
+                for(i = 1; i < len_path_pts; i = i + 1)
+                    section(pth_pts[i - 1], pth_pts[i],  i)
+            ];
 
-        function calculated_sections() =
-            let(sections = path_extrude_inner(1))
+        calculated_sections =
             closed && pth_pts[0] == pth_pts[len_path_pts_minus_one] ?
-                concat(sections, [sections[0]]) : // round-robin
-                concat([section(pth_pts[0], pth_pts[1], 0)], sections);
-    
-    sections = calculated_sections();
+                concat(path_extrude_inner, [path_extrude_inner[0]]) : // round-robin
+                concat([section(pth_pts[0], pth_pts[1], 0)], path_extrude_inner);
 
         polysections(
-            sections,
+            calculated_sections,
             triangles = triangles
         );   
 
         // hook for testing
-        test_path_extrude(sections);
+        test_path_extrude(calculated_sections);
     }
 
     if(method == "AXIS_ANGLE") {
@@ -219,7 +212,6 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
     } 
 }
 
-
 // override to test
 module test_path_extrude(sections) {