diff --git a/src/experimental/tile_penrose2.scad b/src/experimental/tile_penrose2.scad
index d3fd3f73..d57e709f 100644
--- a/src/experimental/tile_penrose2.scad
+++ b/src/experimental/tile_penrose2.scad
@@ -1,5 +1,3 @@
-use <hull_polyline2d.scad>;
-use <ptf/ptf_rotate.scad>;
 use <util/dedup.scad>;
 
 // tile type
@@ -131,7 +129,10 @@ function tile_penrose2(n, triangles) =
 			[type, [shape[0], shape[3], shape[2]]]
 		]
 	];
-	
+
+use <polyline_join.scad>;
+use <ptf/ptf_rotate.scad>;
+
 module draw(tris, radius) {
 	for(tri = tris) {
 		color(tri[0] == KITE ? "black" : "white")
@@ -139,7 +140,8 @@ module draw(tris, radius) {
 	}
 
 	for(tri = tris) {
-	    hull_polyline2d(tri[1] * radius, .1);
+	    polyline_join(tri[1] * radius)
+		    circle(.1);
 	}
 }
 
diff --git a/src/experimental/tile_penrose3.scad b/src/experimental/tile_penrose3.scad
index 0fde67c8..5df7442b 100644
--- a/src/experimental/tile_penrose3.scad
+++ b/src/experimental/tile_penrose3.scad
@@ -52,13 +52,14 @@ function tile_penrose3(n, triangles) =
 		a = 720 / fn,
 		tris = _penrose3(
 		    is_undef(triangles) ? 
+			    // star
 				let(shape_tri0 = [[1, 0], [1, 0] + _zRotation(-180 + a) * [-1, 0], [0, 0]])
 				[
 					for(i = [0:fn / 2 - 1]) 
 					let(m = _zRotation(i * a), t = [for(p = shape_tri0) m * p])
 					each tri2tile("OBTUSE", t)
 				] :
-            	[for(tri = triangles) each tri2tile(tri[0], tri[1])],
+            	[for(tri = triangles) let(t = tri[1]) each tri2tile(tri[0], [t[1], t[2], t[0]])],
 		    n
 		)
 	)
@@ -82,7 +83,7 @@ radius = 10;
 $fn = 12;
 
 draw(tile_penrose3(5, [
-    ["OBTUSE", [[0, 0], [2, 0], ptf_rotate([2, 0], 108)]]
+    ["OBTUSE", [ptf_rotate([2, 0], 108), [0, 0], [2, 0]]]
 ]), radius);
 
 translate([40, 0])