diff --git a/demo/js-playground/build.gradle.kts b/demo/js-playground/build.gradle.kts
index 603b921a..94835588 100644
--- a/demo/js-playground/build.gradle.kts
+++ b/demo/js-playground/build.gradle.kts
@@ -8,7 +8,7 @@ kscience{
 
 kotlin{
     explicitApi = null
-    js(IR){
+    js{
         useCommonJs()
         browser {
             binaries.executable()
diff --git a/demo/solid-showcase/build.gradle.kts b/demo/solid-showcase/build.gradle.kts
index 8f1c370b..05a02260 100644
--- a/demo/solid-showcase/build.gradle.kts
+++ b/demo/solid-showcase/build.gradle.kts
@@ -1,14 +1,14 @@
 plugins {
     id("space.kscience.gradle.mpp")
-    application
+//    application
 }
 
 kscience {
     useCoroutines()
-    jvm {
-        withJava()
+    jvm()
+    js{
+        binaries.executable()
     }
-    js()
     dependencies {
         implementation(projects.visionforgeSolid)
         implementation(projects.visionforgeGdml)
@@ -21,6 +21,6 @@ kscience {
 
 kotlin.explicitApi = null
 
-application {
-    mainClass.set("space.kscience.visionforge.solid.demo.FXDemoAppKt")
-}
\ No newline at end of file
+//application {
+//    mainClass.set("space.kscience.visionforge.solid.demo.FXDemoAppKt")
+//}
\ No newline at end of file
diff --git a/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/demo.kt b/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/demo.kt
index 5fdec43b..6f2cb61f 100644
--- a/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/demo.kt
+++ b/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/demo.kt
@@ -150,6 +150,10 @@ fun VisionLayout<Solid>.showcase() {
             z = 26
         }
     }
+
+    demo("STL", "STL loaded from URL"){
+        stl("https://ozeki.hu/attachments/116/Menger_sponge_sample.stl")
+    }
 }
 
 fun VisionLayout<Solid>.showcaseCSG() {
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
index aa698409..ce5f588f 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
@@ -67,7 +67,7 @@ public var Vision.visible: Boolean?
  */
 public fun Vision.onPropertyChange(
     scope: CoroutineScope? = manager?.context,
-    callback: (Name) -> Unit
+    callback: suspend (Name) -> Unit
 ): Job = properties.changes.onEach {
     callback(it)
 }.launchIn(scope ?: error("Orphan Vision can't observe properties"))
\ No newline at end of file
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/StlVision.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/StlVision.kt
new file mode 100644
index 00000000..8c975c47
--- /dev/null
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/StlVision.kt
@@ -0,0 +1,25 @@
+package space.kscience.visionforge.solid
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import space.kscience.visionforge.MutableVisionContainer
+import space.kscience.visionforge.VisionBuilder
+import space.kscience.visionforge.setChild
+
+
+public sealed class StlVision: SolidBase<StlVision>()
+
+@Serializable
+@SerialName("solid.stl.url")
+public class StlUrlVision(public val url: String) : StlVision()
+
+@Serializable
+@SerialName("solid.stl.binary")
+public class StlBinaryVision(public val data: ByteArray) : StlVision()
+
+@VisionBuilder
+public inline fun MutableVisionContainer<Solid>.stl(
+    url: String,
+    name: String? = null,
+    action: StlVision.() -> Unit = {},
+): StlVision = StlUrlVision(url).apply(action).also { setChild(name, it) }
\ No newline at end of file
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeBoxFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeBoxFactory.kt
index 21c52198..d6840f75 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeBoxFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeBoxFactory.kt
@@ -5,7 +5,7 @@ import space.kscience.visionforge.solid.detail
 import three.geometries.BoxGeometry
 
 public object ThreeBoxFactory : ThreeMeshFactory<Box>(Box::class) {
-    override fun buildGeometry(obj: Box): BoxGeometry =
+    override suspend fun buildGeometry(obj: Box): BoxGeometry =
         obj.detail?.let { detail ->
             BoxGeometry(obj.xSize, obj.ySize, obj.zSize, detail, detail, detail)
         } ?: BoxGeometry(obj.xSize, obj.ySize, obj.zSize)
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt
index 6b2db845..bcc147c7 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt
@@ -8,7 +8,7 @@ import kotlin.math.PI
 import kotlin.math.pow
 
 public object ThreeConeFactory : ThreeMeshFactory<ConeSegment>(ConeSegment::class) {
-    override fun buildGeometry(obj: ConeSegment): BufferGeometry {
+    override suspend fun buildGeometry(obj: ConeSegment): BufferGeometry {
         val cylinder =  obj.detail?.let {
             val segments = it.toDouble().pow(0.5).toInt()
             CylinderGeometry(
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConvexFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConvexFactory.kt
index 83115b13..b772c1bf 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConvexFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConvexFactory.kt
@@ -4,7 +4,7 @@ import space.kscience.visionforge.solid.Convex
 import three.external.geometries.ConvexBufferGeometry
 
 public object ThreeConvexFactory : ThreeMeshFactory<Convex>(Convex::class) {
-    override fun buildGeometry(obj: Convex): ConvexBufferGeometry {
+    override suspend fun buildGeometry(obj: Convex): ConvexBufferGeometry {
         val vectors = obj.points.map { it.toVector() }.toTypedArray()
         return ConvexBufferGeometry(vectors)
     }
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeFactory.kt
index 7c87a0f3..dcf94717 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeFactory.kt
@@ -84,7 +84,7 @@ public fun Object3D.updateProperty(source: Vision, propertyName: Name) {
  * Generic factory for elements which provide inside geometry builder
  */
 public object ThreeShapeFactory : ThreeMeshFactory<GeometrySolid>(GeometrySolid::class) {
-    override fun buildGeometry(obj: GeometrySolid): BufferGeometry = ThreeGeometryBuilder().apply {
+    override suspend fun buildGeometry(obj: GeometrySolid): BufferGeometry = ThreeGeometryBuilder().apply {
         obj.toGeometry(this)
     }.build()
 }
\ No newline at end of file
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeJsVision.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeJsVision.kt
index dcb328a1..6f6e166a 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeJsVision.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeJsVision.kt
@@ -1,6 +1,5 @@
 package space.kscience.visionforge.solid.three
 
-import org.w3c.dom.url.URL
 import space.kscience.visionforge.solid.SolidBase
 import three.core.Object3D
 
@@ -10,15 +9,3 @@ import three.core.Object3D
 public abstract class ThreeJsVision : SolidBase<ThreeJsVision>() {
     public abstract suspend fun render(three: ThreePlugin): Object3D
 }
-
-public class ThreeStlVision(val url: URL): ThreeJsVision(){
-    override suspend fun render(three: ThreePlugin): Object3D {
-//        suspendCoroutine {
-//
-//        }
-//        STLLoader()
-
-        TODO()
-    }
-
-}
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt
index ab067326..06224bbb 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt
@@ -21,10 +21,11 @@ import kotlin.reflect.KClass
 public abstract class ThreeMeshFactory<in T : Solid>(
     override val type: KClass<in T>,
 ) : ThreeFactory<T> {
+
     /**
      * Build a geometry for an object
      */
-    public abstract fun buildGeometry(obj: T): BufferGeometry
+    public abstract suspend fun buildGeometry(obj: T): BufferGeometry
 
     override suspend fun build(three: ThreePlugin, vision: T, observe: Boolean): Mesh {
         val geometry = buildGeometry(vision)
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt
index 17249648..e2af8c30 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt
@@ -37,6 +37,7 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
         objectFactories[SolidLabel::class] = ThreeCanvasLabelFactory
         objectFactories[AmbientLightSource::class] = ThreeAmbientLightFactory
         objectFactories[PointLightSource::class] = ThreePointLightFactory
+        objectFactories[StlVision::class] = ThreeStlFactory
     }
 
     @Suppress("UNCHECKED_CAST")
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeSphereFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeSphereFactory.kt
index d738c073..9753f9ad 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeSphereFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeSphereFactory.kt
@@ -6,7 +6,7 @@ import three.core.BufferGeometry
 import three.geometries.SphereGeometry
 
 public object ThreeSphereFactory : ThreeMeshFactory<Sphere>(Sphere::class) {
-    override fun buildGeometry(obj: Sphere): BufferGeometry {
+    override suspend fun buildGeometry(obj: Sphere): BufferGeometry {
         return obj.detail?.let { detail ->
             SphereGeometry(
                 radius = obj.radius,
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeStlFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeStlFactory.kt
new file mode 100644
index 00000000..d21389aa
--- /dev/null
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeStlFactory.kt
@@ -0,0 +1,38 @@
+package space.kscience.visionforge.solid.three
+
+import org.khronos.webgl.ArrayBuffer
+import org.khronos.webgl.Int8Array
+import space.kscience.visionforge.solid.StlBinaryVision
+import space.kscience.visionforge.solid.StlUrlVision
+import space.kscience.visionforge.solid.StlVision
+import three.core.BufferGeometry
+import three.external.loaders.STLLoader
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+import kotlin.coroutines.suspendCoroutine
+
+fun ArrayBuffer.toByteArray(): ByteArray = Int8Array(this).unsafeCast<ByteArray>()
+
+public object ThreeStlFactory : ThreeMeshFactory<StlVision>(StlVision::class) {
+
+    private val loader = STLLoader().apply {
+        requestHeader = listOf("Access-Control-Allow-Origin: *")
+    }
+
+    override suspend fun buildGeometry(obj: StlVision): BufferGeometry = when (obj) {
+        is StlBinaryVision -> loader.parse(obj.data)
+        is StlUrlVision -> suspendCoroutine { continuation ->
+            loader.load(
+                url = obj.url,
+                onLoad = {
+                    continuation.resume(it)
+                },
+                onError = {
+                    continuation.resumeWithException(RuntimeException("Failed to load STL object from ${obj.url}"))
+                }
+            )
+        }
+    }
+
+
+}
\ No newline at end of file
diff --git a/visionforge-threejs/src/main/kotlin/three/external/loaders/STLLoader.kt b/visionforge-threejs/src/main/kotlin/three/external/loaders/STLLoader.kt
index 5fa253ab..e3e6133f 100644
--- a/visionforge-threejs/src/main/kotlin/three/external/loaders/STLLoader.kt
+++ b/visionforge-threejs/src/main/kotlin/three/external/loaders/STLLoader.kt
@@ -22,17 +22,19 @@
  * THE SOFTWARE.
  */
 
-@file:JsModule("three")
+@file:JsModule("three/examples/jsm/loaders/STLLoader.js")
 @file:JsNonModule
 
 package three.external.loaders
 
+import org.khronos.webgl.ArrayBuffer
 import org.w3c.xhr.XMLHttpRequest
 import three.core.BufferGeometry
-import three.core.Object3D
 
 external class STLLoader {
 
+    var requestHeader: List<String>
+
     fun load(
         url: String,
         onLoad: (BufferGeometry) -> Unit,
@@ -40,7 +42,10 @@ external class STLLoader {
         onError: () -> Unit = definedExternally
     )
 
-    fun parse(data: String): Object3D
-    fun parse(data: ByteArray): Object3D
+    fun parse(data: String): BufferGeometry
+
+    fun parse(data: ByteArray): BufferGeometry
+
+    fun parse(data: ArrayBuffer): BufferGeometry
 
 }
\ No newline at end of file