Add Bambu Studio cylinder creation tutorial with screenshots

- Add step-by-step instructions for creating 25mm x 50mm cylinder
- Include screenshots showing primitive creation and resizing process
- Add alternative CAD software options for participants
- Provide visual guidance for challenge model creation

challenges.md

@@ -75,7 +75,36 @@ Experience the clarity of 3D Fuel's "Clearly Natural" filament in this transpare
 - **Judging Period**: October 29-30, 2025
 - **Winner Announcement**: October 31, 2025
 
-### 💡 Tips for Success
+### <20> Creating the Cylinder Model
+
+#### Using Bambu Studio
+
+**Step 1: Add Primitive**
+
+1. Open Bambu Studio to a new project
+2. Right-click on the build plate
+3. Select "Add Primitive"
+4. Select "Cylinder"
+
+![Adding Cylinder Primitive](./.images/Oct-Comp-ss1.png)
+
+**Step 2: Resize the Cylinder**
+
+1. Click to resize the cylinder
+2. Uncheck "uniform scale" if checked
+3. Set X and Y to 25mm
+4. Set Z to 50mm
+
+![Resizing Cylinder Dimensions](./.images/Oct-Comp-ss2.png)
+
+#### Alternative Methods
+
+- **Fusion 360**: Create cylinder sketch, extrude to 50mm height
+- **Tinkercad**: Use cylinder shape, adjust dimensions
+- **FreeCAD**: Create cylinder with specified dimensions
+- **Any CAD Software**: Simple cylinder 25mm diameter × 50mm height
+
+### <20>💡 Tips for Success
 
 - **Vase Mode Settings**: Ensure single perimeter, no infill, no top layers
 - **Layer Height**: Experiment with smaller layer heights (0.1-0.2mm) for better clarity