Nordic Rune Lock Diary Box Book Safe puzzle

Nordic Rune Lock Diary Box – 400 Combination Book Safe 🔐ᚱ

This project is a mystical Nordic-style lock box designed to hide and protect a diary, journal, or other personal items. Inspired by Norse runes and Viking aesthetics , the box features two rotating rune dials that form a mechanical combination lock with 400 possible combinations .

The lid opens with a spring-assisted mechanism : once the correct rune combination is set, the lock releases and the lid automatically pops open . ✨

This makes it a fun secret diary safe, puzzle box, or fantasy-themed storage box for your desk or shelf.

🎨 Printing

The model was designed without using an AMS , since I do not own one. Only two colors are required , so it can easily be printed with manual filament swaps .

For my example print I used three colors , but feel free to experiment with your own color combinations to create unique versions of the box. Different colors can give it a completely different look! 🎨

Manual Color Changes

The gemstone in the center and the two rune dials require manual color changes .

To make this easier, I already added print pauses at the correct layers , so you can simply swap the filament during printing to achieve a clean two-color result without an AMS .

Just resume the print after changing the filament and the printer will continue normally.

🔧 Required Parts

To enable the automatic opening mechanism you will need:

- 2 small rubber bands These provide the tension that makes the lid pop open automatically .

Without rubber bands the box will still work, but you will need to slide the buttons aside manually to open the lock.

🔐 How the Lock Works

- Rotate the rune dials to the correct combination . - The locking mechanism releases. - The lid automatically pops open thanks to the rubber bands. To close the box again:

- Slide both buttons to the side . - Rotate one of the rune dials to reset the lock. The combination can be set by the user , so you can choose your own secret rune code.

📚 Book Size

Maximum book size that fits inside the box:

21.5 × 17.5 × 4.5 cm

🖨 Printer Compatibility

Due to its size, this model cannot be printed on the A1 Mini .

If there is interest, I can create:

- a smaller version for the A1 Mini - a version for thicker books 🛠 Assembly & Cleaning

Step 1:

Some support structures are required for printing.

To remove them cleanly I recommend using:

- a small precision screwdriver - a hobby knife / cutter Take your time when removing supports to avoid damaging the moving parts.

Step 2: First, firmly insert the 8 decorative pieces into the front plate. Then, place the gemstone into the center of the middle part shown on the right in the picture.

Step 3:

Place the large dial into the hole in the middle of the front plate.

Step 4:

Attach the middle piece to the front plate so that the large dial cannot fall out .

Step 5:

Flip the front plate over and place the small dial inside the larger dial.

Step 6:

Then, screw the black round threaded plate on top to secure the small dial. Do not tighten too much , or the small dial may become harder to rotate.

Step 7:

Flip the front plate back and set your combination by turning the dials to your desired code.