This is a mechanical puzzle Lu Ban lock / mystery storage box created using 3D printing. Its exterior perfectly replicates the standard six-sided dice shape and belongs to the puzzle box category—ideal for escape room challenges or trendy handmade toys.

• Appearance disguise: The outer appearance looks exactly like an ordinary dice, with hidden mechanisms triggered by the numbered holes; from the outside, you can’t tell how it opens or closes.

• Mechanism and puzzle core: You must press, slide, and rotate the corresponding numbered circular holes in a specific sequence to release internal latches and unlock the box.

• Storage purpose: With a hollow interior, it can hold rings, earrings, miniature jewelry, small keepsakes, or surprise gifts, making it perfect as a creative gift, an escape room prop, or a desk stress-relief toy.

   

I’ve produced two versions: one is a multi-color print (NO AMS), which delivers superior printing quality but requires assembly; the other is a single-color print version, simpler to assemble but lacking the visual appeal of the multi-color option.

I have made two versions: one is a multi-color print (without  AMS), which offers superior printing quality but requires assembly; the other is a single-color print version, which has a simpler assembly process but does not match the quality of the multi-color version.

Here are the assembly steps:

All the parts All the parts
1. First, take out three sticks of the same length (3) and the shortest stick (1). Place two of the sticks (3) into the grooves and then insert the shortest stick (1) vertically between them. First, take out three sticks of the same length (3) and the shortest stick (1). Place two of the sticks (3) into the grooves and then insert the shortest stick (1) vertically between them.
2. Stick lengths and placement The position of the sticks
3. Install the internal structure and cover it with the lid. After completing the internal structure installation, cover it with the lid.
4. Attach the outer shell, securing each side with just one nut. For the top and bottom surfaces, you can use two nuts, depending on your specific needs. Attach the outer shell, securing each side with just one nut. For the top and bottom surfaces, you can use two nuts, depending on your specific needs.
5. Appearance after installing the outer shell. The appearance after installing the outer shell.
6. Single-color printed outer shell that requires no assembly. Single-color printed outer shell that requires no assembly.
7. Slide the cover plate into the latch slot, and the installation is complete. Slide the cover plate into the latch slot, and the installation is complete.
8. Steps to open and close the box. Steps to open and close the box.