diff --git a/notes.md b/notes.md
index 78f9eb5e..e70c94f9 100644
--- a/notes.md
+++ b/notes.md
@@ -60,11 +60,14 @@
 
 # CAM
 
+* `B` failure to go *up* when moving between parts
 * `B` starting export during animation unleashes chaos
 * `B` climb vs conventional not fully consistent after refactor
 * `B` outside cutting direction in roughing mode inverted
 * `B` top clearing operations should use linear, not offset, passes
 * `B` on rotation, tabs dissociate from parts whose center changes with rotation
+* `F` duplicating a part should duplicate added features like tabs
+* `F` validate muti-part layout and spacing exceeds largest outside tool diameter
 * `F` skip "thru" holes checkbox for roughing and outlining
 * `F` polygon simplification option in tracing (for image derived maps)
 * `F` use 3 registration holes to prevent rotation accidents (midline offset one axis)
diff --git a/src/mode/laser/driver.js b/src/mode/laser/driver.js
index d3134617..84bddf1d 100644
--- a/src/mode/laser/driver.js
+++ b/src/mode/laser/driver.js
@@ -205,7 +205,7 @@
                 let merged = [];
                 widget.slices.forEach(function(slice) {
                     let polys = [];
-                    slice.offsets.clone(true).forEach(p => p.flattenTo(polys));
+                    slice.offset.clone(true).forEach(p => p.flattenTo(polys));
                     polys.forEach(p => {
                         let match = false;
                         for (let i=0; i<merged.length; i++) {