diff --git a/client/src/shapes/PufferShapeUtil.tsx b/client/src/shapes/PufferShapeUtil.tsx
index 4ecc9e9..3c0b10d 100644
--- a/client/src/shapes/PufferShapeUtil.tsx
+++ b/client/src/shapes/PufferShapeUtil.tsx
@@ -62,11 +62,14 @@ export class PufferShapeUtil extends ShapeUtil<PufferShape> {
     { handle }: { handle: TLHandle }
   ): TLShapePartial<PufferShape> | void {
     if (handle.id === 'top') {
-      const newH = Math.min(CFG.maxH, Math.max(CFG.minH, shape.props.h - handle.y))
+      // Bottom edge stays fixed; compute new height from mouse page position
+      const bottom = shape.y + shape.props.h
+      const mouseY = this.editor.inputs.currentPagePoint.y
+      const newH = Math.min(CFG.maxH, Math.max(CFG.minH, bottom - mouseY))
       return {
         id: shape.id,
         type: 'puffer',
-        y: shape.y + (shape.props.h - newH),
+        y: bottom - newH,
         props: { ...shape.props, h: newH },
       }
     }
diff --git a/client/src/shapes/shape-config.ts b/client/src/shapes/shape-config.ts
index 7587d44..3caada5 100644
--- a/client/src/shapes/shape-config.ts
+++ b/client/src/shapes/shape-config.ts
@@ -2,17 +2,17 @@
  * Zentrale Konfiguration für alle Custom Shapes.
  * Defaults, Minima und Maxima an einer Stelle gepflegt.
  */
-
+// Angaben in cm
 export const PUFFER_CONFIG = {
   // Defaults
-  defaultW: 120,
-  defaultH: 60,
+  defaultW: 240,
+  defaultH: 150,
   // Minima
-  minW: 20,
-  minH: 20,
+  minW: 240,
+  minH: 150,
   // Maxima
-  maxW: 500,
-  maxH: 300,
+  maxW: 4000,
+  maxH: 20000,
 }
 
 export const KREISEL_CONFIG = {
@@ -20,7 +20,7 @@ export const KREISEL_CONFIG = {
   defaultAbstand: 200,
   defaultRadius: 80,
   // Minima
-  minAbstand: 20,
+  minAbstand: 180,
   // Maxima
   maxAbstand: 4000,
 }