This is my tiny vault with auto-locking mechanism. It makes clicking sounds while opening, and the button automatically locks the door after closing, without the need to turn the handle.

For the door hinge, you need to use a piece of filament (approximately 26 mm).

Even though I tried to design it to avoid using glue, the small size makes glue necessary for some parts.

I have attached the assembly guide, but if you have any questions, feel free to ask in the comments.

I am excited to see your vaults and the color combinations you come up with! =)

UPDATE:

If the clicking and locking mechanism isn't working properly, please try the following:

1. The gears might not be rotating smoothly. Apply some oil to the gears to improve their movement.
2. If the small part responsible for the clicking doesn't fit tightly, you might need to glue it in place