From 76c8f18fd437d2b9b80b5cf417edf7ef1897412d Mon Sep 17 00:00:00 2001
From: Adrian Mariano <avm4@cornell.edu>
Date: Thu, 25 Apr 2024 16:40:32 -0400
Subject: [PATCH] fix tutorial issue

---
 attachments.scad | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/attachments.scad b/attachments.scad
index 8c76bb6..9add0f3 100644
--- a/attachments.scad
+++ b/attachments.scad
@@ -3449,7 +3449,7 @@ function _get_cp(geom) =
 
 
 function _force_anchor_2d(anchor) =
-  is_undef(anchor) ? anchor :
+  is_undef(anchor) || len(anchor)==2 ? anchor :
   assert(anchor.y==0 || anchor.z==0, "Anchor for a 2D shape cannot be fully 3D.  It must have either Y or Z component equal to zero.")
   anchor.y==0 ? [anchor.x,anchor.z] : point2d(anchor);