diff --git a/rounding.scad b/rounding.scad
index f83a02f3..734e2999 100644
--- a/rounding.scad
+++ b/rounding.scad
@@ -2572,8 +2572,9 @@ function rounded_prism(bottom, top, joint_bot=0, joint_top=0, joint_sides=0, k_b
         vnf = vnf_join([ each column(top_samples,0),
                           each column(bot_samples,0),
                           for(pts=edge_points) vnf_vertex_array(pts),
-                          debug ? vnf_from_polygons(faces,fast=true) 
-                                : vnf_triangulate(vnf_from_polygons(faces))
+                          vnf_from_polygons(faces,fast=true) 
+                          // debug ? vnf_from_polygons(faces,fast=true) 
+                          //      : vnf_triangulate(vnf_from_polygons(faces))
                        ]),
 
         topnormal = unit(cross(top[0]-top[1],top[2]-top[1])),
diff --git a/skin.scad b/skin.scad
index b6344ca6..b33f5ca7 100644
--- a/skin.scad
+++ b/skin.scad
@@ -2276,6 +2276,9 @@ function path_sweep(shape, path, method="incremental", normal, closed, twist=0,
   assert(!closed || !approx(path[0],last(path)), "\nClosed path includes start point at the end.")
   assert((is_region(shape) || is_path(shape,2)) || (transforms && !(closed && method=="incremental")),"\nshape must be a 2d path or region.")
   let(
+    caps = !closed ? caps
+         : assert(is_undef(caps) || caps==false || caps==[false,false], "Cannot specify caps when closed=true")
+           false, 
     path = path3d(path),
     normalOK = is_undef(normal) || (method!="natural" && is_vector(normal,3))
                                 || (method=="manual" && same_shape(normal,path)),