diff --git a/notes.md b/notes.md
index f9a4c506..4566de31 100644
--- a/notes.md
+++ b/notes.md
@@ -2,7 +2,7 @@
 
 ## `C` cosmetic, `F` functional, `P` performance, `B` bug fix
 
-* `B` client/worker cache invalidated by latest rotation work
+* `B` client/worker cache invalidated by latest rotation work. revisit sync.
 * `B` normals possibly inverted on faces in 2D to 3D conversion
 * `B` origin bug (Onshape?) when switching modes in 2.5 and 2.6
 
@@ -19,13 +19,12 @@
 
 # FDM
 
-* `B` fix adaptive slicing with multi-extruder
+* `B` infill densities are inaccurate
 * `B` fix support projection/end with grouped parts
 * `B` multi-extruder rendering of raft fails to offset the rest of the print
 * `B` multi-extruder purge blocks fail to generate properly for rafts
-* `B` first layer support speed should be same as shell speed
 
-* `F` test outlining solid projected areas
+* `F` test outlining solid projected areas (internally)
 * `F` slicing controls per user-defined z-region
 * `F` control for size of purge block (with 0=disabled)
 * `F` polishing and other non-planar work
diff --git a/src/kiri/client.js b/src/kiri/client.js
index 7f6a660b..c54dca80 100644
--- a/src/kiri/client.js
+++ b/src/kiri/client.js
@@ -110,9 +110,9 @@ KIRI.work = {
         send("config", obj, function(reply) { });
     },
 
-    clear: function(widget) {
+    clear: function() {
         syncd = {};
-        send("clear", widget ? {id:widget.id} : {}, function(reply) { });
+        send("clear", {}, function(reply) { });
     },
 
     snap: function(data) {
diff --git a/src/kiri/main.js b/src/kiri/main.js
index 57bd1554..b397942f 100644
--- a/src/kiri/main.js
+++ b/src/kiri/main.js
@@ -871,9 +871,6 @@
         setOpacity(color.slicing_opacity);
 
         STACKS.clear();
-        if (mode === 'FDM') {
-            KIRI.client.clear();
-        }
         KIRI.client.sync();
         KIRI.client.rotate(settings);
 
diff --git a/src/kiri/worker.js b/src/kiri/worker.js
index 77c363d8..3e4711e9 100644
--- a/src/kiri/worker.js
+++ b/src/kiri/worker.js
@@ -44,19 +44,9 @@ KIRI.worker = {
     clear: function(data, send) {
         current.snap = null;
         current.print = null;
-        if (!data.id) {
-            dispatch.group = wgroup = {};
-            dispatch.cache = wcache = {};
-            send.done({ clear: true });
-            return;
-        }
-        let had = wcache[data.id] !== undefined;
-        delete wcache[data.id];
-        send.done({
-            id: data.id,
-            had: had,
-            has: wcache[data.id] !== undefined
-        });
+        dispatch.group = wgroup = {};
+        dispatch.cache = wcache = {};
+        send.done({ clear: true });
     },
 
     // widget sync
diff --git a/src/mode/fdm/client.js b/src/mode/fdm/client.js
index 432399ca..e575e243 100644
--- a/src/mode/fdm/client.js
+++ b/src/mode/fdm/client.js
@@ -23,13 +23,18 @@
 
         function filterSynth() {
             // remove synth widgets
+            let clear = false;
             api.widgets.filter((widget) => {
                 if (widget.track.synth) {
                     api.const.SPACE.platform.remove(widget.mesh);
                     kiri.Widget.Groups.remove(widget);
+                    clear = true;
                 }
                 return !widget.track.synth
             });
+            if (clear) {
+                kiri.client.clear();
+            }
         }
 
         api.event.on("mode.set", mode => {