Demon Slayer Infinity Castle Tabletop Decoration

In this instructable, I’m combining the magic of anime with the mystery of optical illusions to create a Demon Slayer Infinity Castle Tabletop Decoration—a stunning display inspired by Muzan’s ever-shifting lair from Demon Slayer: Kimetsu no Yaiba.

At the heart of this project is the infinity mirror technique, which creates the illusion of endless depth using simple lighting and reflective layers. With this mesmerizing effect, I’ll show you how to bring the surreal, multi-dimensional feel of the Infinity Castle to life in a compact, eye-catching decoration perfect for your desk or anime shelf.

Whether you’re a seasoned crafter or just starting out, this project is a fun way to explore a mix of creative skills—from assembling mirrors and LED lights to designing architectural elements that reflect the dark, elegant aesthetic of the show. Let’s dive in and start crafting your very own piece of the Demon Slayer universe!

In this project, you are going to need:

1. Paper: I used 230 gsm art paper
2. Cutting machine/cutting pen
3. White Glue
4. Vellum paper/parchment paper
5. Cardboard
6. Chipboard
7. Super Glue
8. Photo frame
9. Mirror
10. One-way mirrored acrylic sheet or one-way mirror film sheet
11. PVC decorative sheet: wood
12. LED

To design the Demon Slayer Infinity Castle, I started by modeling it in Fusion 360. While the structure is fairly simple, creating it in 3D helped me better visualize how the final piece would come together. This step was especially helpful since I planned to use an infinity mirror effect—it gave me a clearer sense of depth and perspective.

Once the 3D model was complete, I used Fusion 360’s Flat Pattern feature to generate flat patterns of each part of the castle. This allowed me to create precise paper templates, which I exported as DXF files. Then, using Inkscape, I edited and converted these into SVG files compatible with my cutting machine. This workflow saved a lot of time and ensured clean, accurate cuts.

Technically, I could’ve built the castle layout directly in Inkscape, but using Fusion 360 made the whole process more intuitive and gave me confidence in the final dimensions and fit.

As for inspiration, I referred to a Demon Slayer Infinity Castle 3D modeling video by AeroArtz and a Demon Slayer-inspired coffee table by Sam. Though my version ended up looking a bit different from those references (moreover the actual anime), they definitely helped shape the direction of my design.

💡 New to Fusion 360? So Was I!

If you’re thinking about designing your version of the Demon Slayer Infinity Castle but have never used Fusion 360 before, don’t worry—you’re not alone. This project was actually my first time using Fusion, too!

To help me get started, I watched several beginner-friendly YouTube tutorials that walked me through the basics of sketching, extruding, and unfolding models for papercraft. I’ve compiled a playlist of the videos that were especially helpful during my process—you can check it out [here].

With a bit of patience and practice, you’ll be surprised how quickly you can start building your own 3D models and turning them into awesome papercraft templates.

While you’re absolutely welcome to create your own design, I’ve also made it easy for you by sharing my own Demon Slayer Infinity Castle building templates—ready to use with a cutting machine!

You’ll get 5 building models in SVG format:

1. Building 1
2. Building 2
3. Railing 1
4. Railing 2
5. Lantern

Each design features short-cutting lines that indicate where to fold or crease the paper. In the images above, I’ve highlighted these crease lines by changing them into red dashed lines, so you can clearly see where scoring or folding is needed.

📌 Note for Building 1: You’ll notice it’s split into two separate components—don’t worry, they form one complete building when assembled. I divided it into two pieces to fit within the cutting limits of my machine’s mat size.

You can download the SVG files below.

For this project, I used 230gsm art paper—sturdy enough to hold shape, but still easy to fold. To give the castle a more authentic, wooden look, I printed wood textures onto the paper before cutting. I found the textures on Freepik, using two styles:

1. Dark wood texture for some buildings
2. Lighter wood texture for variation

You can use any texture you like, but printed wood grain really adds to the mood and aesthetics of the Demon Slayer Infinity Castle.

I used a LOKLiK iCraft cutting machine for this project. Here are a few tips to help your cutting go smoothly:

1. Import the SVG files into your cutting software and prepare the template layout.
2. I recommend cutting one building template at a time—some pieces have very small, detailed cuts, and doing too much at once might cause the machine to overheat.
3. After cutting, use a weeding tool to gently release the pieces from the cutting mat without tearing the paper.

Take your time with the process—this is where the clean, crisp look of your castle starts to come together!

Now that all your pieces are cut, it’s time to bring the Demon Slayer Infinity Castle to life!

For assembly, I used white glue (you can also use wood glue) to stick the parts together securely. Be sure to apply the glue sparingly to avoid warping the paper—especially around delicate details.

Building 1 and Building 2 are inspired by shoji—the traditional Japanese sliding panels made from a wooden frame and translucent paper (usually washi). These panels are commonly used in homes as room dividers, doors, or windows, softly diffusing light and creating a serene atmosphere.

To recreate that translucent effect, I used vellum paper for the inner layer of the windows. If you don’t have vellum, parchment paper works as a great alternative. This same paper will also be used to create the glowing effect in the lantern model, making the whole piece look more atmospheric—especially when paired with LED lighting.

Take your time folding along the crease lines and glue carefully to maintain clean edges.

For Building 1 you will notice that it has no roof in the template, that's because I originally wanted to glue the Railing 1 on top and bottom of Building 1, but then decided not to. So I added a paper as the roof of Building 1 then glued Building 1 on the center of Railing 1 and glued some of the Lantern around Building 1.

For the base of the Demon Slayer Infinity Castle, I created two layers of structure: an inner box and an outer box.

I made the inner box using corrugated cardboard for lightweight strength, and the outer box using chipboard for a smooth, clean finish. The reason for having two boxes is to hide all the wiring for the LED lights we'll install later—everything stays tucked away neatly between the layers.

Outer Box: Using a Photo Frame as a Mold

To shape the outer box, I used a 20x25 cm (8R) photo frame as a mold. I found that using the frame’s molding helped create a more precise and sturdy shape, compared to manually shaping the box entirely out of chipboard. Plus, the raised edges of the frame gave the structure a polished, elevated look—almost like a display case.

The depth of the outer box: 17.5 cm

Inner Box: Fitting the Frame

The inner box was sized to fit exactly into the inner part of the photo frame molding—the section where the glass would usually sit. This ensures the two boxes nest perfectly, and it makes installing the mirror and lighting components easier later on.

The dimensions of the inner box: are 25 x 20 x15.5 cm

Now comes the fun (and slightly chaotic) part—laying out the buildings on the base!

To be honest, I wasn’t sure if I had made too many buildings or not enough, so I just started experimenting with different arrangements until it felt right. My goal was to recreate the feeling from the anime—random, disorienting, and surreal like you can’t quite tell which way is up or down. That chaotic layout is what gives the Infinity Castle its magical, otherworldly vibe.

At the same time, it’s important to leave some space between the structures, so the infinity mirror effect can work its magic and reflect the buildings from all angles. Don’t overcrowd it—let the reflections breathe.

Once I was happy with the layout, I marked the positions of each component on the inner box. Then, I punched small holes where I wanted the LED lights to go, both on the base and through some of the buildings themselves—this will help the lights glow through the windows and lanterns later.

Take your time here—this step really sets the mood for the whole piece!

Before permanently gluing the buildings into the inner box, I decided to add a bit more detail by covering the inside surface with a PVC decorative sheet that has a wood texture. This gave the base a more polished, elegant look—almost like a wooden floor for the Infinity Castle.

After applying the sheet, I carefully re-punched all the LED holes to make sure everything was aligned and functional. Then, I re-arranged the buildings according to the layout I finalized earlier and glued them down with super glue for a strong, permanent hold.

Make sure everything is exactly where you want it before gluing—super glue sets fast, and you want those reflections to line up just right!

When it comes to the LED wires, I let them stay a little chaotic outside the inner box—this gives me more flexibility when adjusting things later (or maybe I was just lazy). But if you prefer a cleaner look (or just want to avoid tangling), you can tidy them up using tape or small cable clips.

Keeping the wires a bit loose can actually help during the next step, when we insert the inner box into the outer box—you’ll have more room to maneuver and make adjustments without stressing the wires or connections.

Just make sure none of the wires get in the way of the mirror or buildings, and you’re good to go!

To give the outer box a finished, display-worthy look, I also covered it with a PVC decorative sheet—the same kind I used for the inside base. This not only ties the whole piece together visually but also makes it look more polished and professional.

When applying the PVC sheet, I recommend using a scraper tool (or even a plastic card) to help smooth out the surface and eliminate air bubbles. Work slowly from one side to the other to get the cleanest finish possible.

Take your time with this step—it really makes the entire project feel complete!

If you're using a ready-made one-way mirror, then you're all set for this step. But if you're like me and using mirror film, you'll need to apply it manually to the photo frame glass.

Start by cutting the mirror film slightly larger than the glass—this gives you some wiggle room when applying it. It’s really important to work in a dust-free area because static from the film can attract dust, which will affect the final look.

A quick tip: The mirror film I used came with a protective plastic layer over the adhesive side. To peel it off more easily, you can stick two pieces of tape—one on each side of the corner—and gently pull them apart to separate the layers.

How to Apply Mirror Film

1. Clean the glass thoroughly first.
2. Use a spray bottle with soapy water (I just used my hand to spread the mixture).
3. Spray the soapy water onto the glass to make it easier to reposition the film and avoid air bubbles.
4. Carefully lay the mirror film onto the wet glass surface.
5. Use a squeegee (or a scraper/plastic card) to gently push out all the water and air bubbles from the center outward.
6. Once it’s smooth, trim the excess film from the edges for a clean fit.

watch a tutorial

Give it a few minutes to fully dry before inserting it into the box. Now your mirror base is ready to create that infinite reflection magic!

It’s finally time to place the Demon Slayer Infinity Castle inside the outer box!

But first—don’t forget to install the one-way mirror into the photo frame. This is a crucial part of creating the infinity mirror effect. Carefully place the mirror on the frame, the reflective side facing inward.

Then, slowly lower the inner box (with all the buildings and LEDs) into the outer box. Lower the inner box gently into place, making sure none of the LED wires get caught or pinched by the edges of the outer box. If a wire gets stuck, it might cause the LEDs inside the buildings to shift, and we don’t want that after all the work we’ve done!

Take your time, adjust as needed, and make sure everything sits securely.

Installing the Back Mirror

For the back of the box, I used a regular mirror, which reflects the light from the one-way mirror and creates an endless illusion. To install it, I glued the mirror onto a piece of cardboard and then attached that to the back side of the outer box.

Instead of sealing the back permanently, I decided to keep it removable, kind of like a door (as you can see there is a hinge on the side of the cardboard). I figured I might want to make another project using the infinity mirror technique in the future, so having a reusable setup just made sense.

This way, the back panel can open and close, making it easier to tweak the inside, replace LEDs, or even swap out the entire scene someday.

Creating this Demon Slayer Infinity Castle tabletop decoration has been such a fun and rewarding experience. From designing the buildings in Fusion 360 to experimenting with layout and lighting, every step was a chance to learn something new and bring a piece of the anime world to life.

If you're thinking about making your own version—whether you use my design or create one from scratch—don't stress about making it perfect. The magic of this project is in the chaotic, dreamlike illusion, just like in the anime. Embrace the process, experiment, and most importantly, enjoy the journey.

I hope this instructable helps and inspires you to try your own version of the Infinity Castle. If you end up making one, I’d love to see it!

Happy crafting 🛠️✨

Quinzy Varira | Instagram | TikTok | Blog