diff --git a/src/mesh/api.js b/src/mesh/api.js
index ba06893a..c6340149 100644
--- a/src/mesh/api.js
+++ b/src/mesh/api.js
@@ -494,12 +494,12 @@ let sketch = {
     },
 
     boolean: {
-        group() {
-            sketch.selection.one?.boolean.group();
+        nest() {
+            sketch.selection.one?.boolean.nest();
         },
 
-        ungroup() {
-            sketch.selection.one?.boolean.ungroup();
+        flatten() {
+            sketch.selection.one?.boolean.flatten();
         },
 
         union() {
diff --git a/src/mesh/build.js b/src/mesh/build.js
index 7bb32aab..b68a4876 100644
--- a/src/mesh/build.js
+++ b/src/mesh/build.js
@@ -433,8 +433,8 @@ function ui_build() {
                 h.button({ _: 'intersect', onclick: sketch.boolean.intersect }),
                 h.button({ _: 'difference', onclick: sketch.boolean.difference }),
                 h.hr(),
-                h.button({ _: 'group', onclick: sketch.boolean.group }),
-                h.button({ _: 'ungroup', onclick: sketch.boolean.ungroup }),
+                h.button({ _: 'nest', onclick: sketch.boolean.nest }),
+                h.button({ _: 'flatten', onclick: sketch.boolean.flatten }),
             ])
         ]),
         h.div({ class: "sketch-off" }, [
diff --git a/src/mesh/sketch.js b/src/mesh/sketch.js
index 8c25535a..3f07f4d6 100644
--- a/src/mesh/sketch.js
+++ b/src/mesh/sketch.js
@@ -209,7 +209,7 @@ mesh.sketch = class MeshSketch extends mesh.object {
                 }
             },
 
-            group() {
+            nest() {
                 let items = sketch.selection.mesh_items();
                 if (items.length < 2) return log('operation requires at least 2 items');
                 let polys = items.map(i => i.sketch_item.poly).clone(true);
@@ -220,7 +220,7 @@ mesh.sketch = class MeshSketch extends mesh.object {
                 }
             },
 
-            ungroup() {
+            flatten() {
                 let items = sketch.selection.mesh_items();
                 let polys = items.map(i => i.sketch_item.poly).clone(true);
                 let flat = POLYS.flatten(polys, [], true);