Modular Castle Builder | Create & 3D Print Your Own Castles!

Bring your tabletop campaigns, dioramas, or display shelves to life with this highly detailed, 3D-printable castle model! 🏰✨

This fortress was designed using the Modular Castle Builder—a custom-built web tool that lets you visualize and generate your very own modular strongholds. I have included both .STL and .3MF files in this upload so you can drop them straight into your slicer and start printing right away.

🛠️ Create Your Own Modular Castles! Want to design your own custom layout or test out color schemes in a live 3D viewer?

You can use my free web app right in your browser to build and download your own custom STLs! The tool is currently in active development, and right now there are 20 unique castle presets to choose from, ranging from small keeps to grand fortresses. You can now create your own castle by simply dragging and dropping objects in build mode. (Advanced Procedural Generation is also in the works and coming soon!)

👉 Try the Modular Castle Builder here: 

🎥 See it in action on YouTube: 

Web App:

📦 Modular Castle Storage Boxes Included! To keep your castle pieces organized, this collection includes custom-designed Castle Box Storage systems. Depending on how many pieces you print, you can choose from:

• Small Box (160mm x 160mm x 96mm) - Stores up to 30 objects
• Medium Box (200mm x 200mm x 96mm) - Stores up to 50 objects
• Large Box (240mm x 240mm x 96mm) - Stores up to 70 objects

🧱 Included Assets (L x H x W mm): The Modular Castle system includes a huge variety of interchangeable pieces:

1. Block_Square_Solid         - 40x40x40
2. Block_Square_Window    - 40x40x40
3. Block_Round_Solid          - 40x40x40
4. Block_Round_Window     - 40x40x40
5. Block_House                    - 40x40x40
6. Wall_Standard                  - 80x50x20
7. Wall_Gatehouse               - 80x50x20
8. Wall_Portcullis                  - 22x36x5
9. Tower_Square_Small       - 40x40x40
10. Tower_Square_Grand      - 60x40x60
11. Tower_Round_Small        - 40x40x40
12. Tower_Round_Grand       - 60x40x60
13. Roof_Square_Pyramid     - 40x35x40
14. Roof_Round_Cone          - 40x35x40
15. Accessory_Staircase       - 35x35x20

⚙️ Recommended Print Settings:

• Layer Height: 0.16mm - 0.20mm (0.16mm is recommended for the cleanest look on the brickwork and windows).
• Wall Lines (Perimeters): 3 walls (ensures the structural integrity of the interlocking parts and storage boxes).
• Infill: 10% - 15% Gyroid or Grid (you don't need much; the walls provide most of the strength).
• Supports: NO SUPPORTS needed for the castle objects! All walls, towers, roofs, and accessories print completely support-free.
  • Note: The Castle Storage Boxes require very minimal supports ONLY under the Door Arc.
• Brim: Not required unless you have adhesion issues with smaller parts like the portcullis.
• Pro Slicer Tip: When importing the main castle files into your slicer, the Gatehouse will separate into 2 distinct objects (the stone gate and the wooden portcullis). This allows you to print the portcullis in black/brown filament and the walls in stone/tan filament without needing a multi-color printer!

If you print this and paint it, I'd love to see photos of your makes! Drop a like, share your prints, and let me know what other castle styles you’d like to see next.🚀