revert yBar changes, also WIP on side connectors and side wall

helper/math.scad

@@ -18,11 +18,11 @@ module align(a,b) {
     echo("b", b);
     rot_axis = cross(a,b);
 
-    if (rot_axis == 0) {
+    if (rot_axis == [0,0,0]) {
         error("Can't align - provided vectors are parallel");
     }
 
-    echo("rot_axis", rot_axis);
+    //echo("rot_axis", rot_axis);
 
     angle = acos(a*b/(norm(a)*norm(b)));
     echo("angle", angle)