From 8fcfdd749986e8ccf11ef333f313aa5669c26930 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Thu, 11 Dec 2025 08:29:21 -0500
Subject: [PATCH] limit return to non-empty slices

---
 src/kiri/mode/cam/op-area.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/kiri/mode/cam/op-area.js b/src/kiri/mode/cam/op-area.js
index efed7d1f..a30ff919 100644
--- a/src/kiri/mode/cam/op-area.js
+++ b/src/kiri/mode/cam/op-area.js
@@ -342,7 +342,8 @@ class OpArea extends CamOp {
             }
         }
 
-        addSlices(areas.flat());
+        // return only slices containing ares to mill
+        addSlices(areas.flat().filter(s => s.camLines && s.camLines.length));
     }
 
     prepare(ops, progress) {