From a0ebee2ca3fa6dbbdf2854824109a0929593a5ad Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sat, 21 Jan 2012 11:34:03 +0100
Subject: [PATCH] Warn if no layers were detected

---
 lib/Slic3r/Print.pm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index c79c14a8a..0e0d474b2 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -138,6 +138,9 @@ sub new_from_mesh {
         }
     }
     
+    warn "No layers were detected. You might want to repair your STL file and retry.\n"
+        if !@{$print->layers};
+    
     return $print;
 }