diff --git a/frontend/tools/PlaygroundDialogContent.vue b/frontend/tools/PlaygroundDialogContent.vue
index 741359b..ff5a307 100644
--- a/frontend/tools/PlaygroundDialogContent.vue
+++ b/frontend/tools/PlaygroundDialogContent.vue
@@ -54,8 +54,6 @@ async function setupPyodide() {
   await (micropip.install("lib3mf"))
   micropip.add_mock_package("py-lib3mf", "2.4.1", modules={"py_lib3mf": '''from lib3mf import *'''})
   await (micropip.install(["build123d"]))`, output);
-    output("Preimporting build123d...\n");
-    await asyncRun(`import build123d`);
     if (props.initialCode != "") {
       await runCode();
       opacity.value = 0.0; // Hide editor after running initial code
diff --git a/frontend/tools/Tools.vue b/frontend/tools/Tools.vue
index ed3422d..5837a1b 100644
--- a/frontend/tools/Tools.vue
+++ b/frontend/tools/Tools.vue
@@ -45,11 +45,11 @@ const PlaygroundDialogContent = defineAsyncComponent({
 let props = defineProps<{ viewer: InstanceType<typeof ModelViewerWrapper> | null }>();
 const emit = defineEmits<{ findModel: [string] }>()
 
-const sett = ref(null);
+const sett = ref<any | null>(null);
 const showPlaygroundDialog = ref(false);
 (async () => {
   sett.value = await settings();
-  return showPlaygroundDialog.value = sett.value.code != "";
+  showPlaygroundDialog.value = sett.value.code != "";
 })();
 
 let selection: Ref<Array<SelectionInfo>> = ref([]);
@@ -169,7 +169,7 @@ window.addEventListener('keydown', (event) => {
       </v-btn>
     </template>
     <template v-slot:default="{ isActive }">
-      <playground-dialog-content v-if="sett != null" :initial-code="sett.code" @close="isActive.value = false"/>
+      <playground-dialog-content v-if="sett != null" :initial-code="sett.value.code" @close="isActive.value = false"/>
     </template>
   </v-dialog>
   <v-btn icon @click="downloadSceneGlb">
diff --git a/vite.config.ts b/vite.config.ts
index 234f944..c6e6910 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -5,8 +5,8 @@ import vue from '@vitejs/plugin-vue'
 import vueJsx from '@vitejs/plugin-vue-jsx'
 import {name, version} from './package.json'
 import {execSync} from 'child_process'
-import { viteStaticCopy } from "vite-plugin-static-copy";
-import { dirname, join } from "path";
+import {viteStaticCopy} from "vite-plugin-static-copy";
+import {dirname, join} from "path";
 
 // https://vitejs.dev/config/
 export default defineConfig({
@@ -22,7 +22,7 @@ export default defineConfig({
         vueJsx(),
         viteStaticCopyPyodide(),
     ],
-    optimizeDeps: { exclude: ["pyodide"] },
+    optimizeDeps: {exclude: ["pyodide"]},
     resolve: {
         alias: {
             // @ts-ignore
@@ -40,6 +40,9 @@ export default defineConfig({
             }
         }
     },
+    worker: {
+        format: 'es', // Use ES modules for workers (IIFE is not supported with code-splitting)
+    },
     define: {
         __APP_NAME__: JSON.stringify(name),
         __APP_VERSION__: JSON.stringify(version),