In the first Harry Potter movie, Harry visits Gringotts Bank to see his vault. When it opens a fascinating mechanism is shown. Making a replica of the door is way too big of a project, so I made this Mini Vault that demonstrates 2 slices of the 7 slice vault door in the movie.

When the vault is locked, all the knobs are also locked.

This design has a working combination lock that can be programmed to custom combinations.

1. When the correct combination is entered the upper left knob enabled, turning this 90 degrees clockwise, releases the pawl locks on the upper slice and enables the upper right and lower left knobs.
2. Turning the upper right knob 90 degrees clockwise slides the pawls of the upper slice from the locked to unlocked position.
3. Turning the lower left knob 90 degrees counterclockwise, releases the pawl locks on the lower slice and enables the lower right knob.
4. Turning the lower right knob 90 degrees clockwise slides the pawls of the loser slice from the locked to unlocked position.
5. And finally the door can be opened.

The process is performed in the reverse order to lock the door.

Note:    Building this design is a lot of work and takes commitment. 

The combintation for the vault can be customized by the position of the stops inserted into the Lock Rotors.

A video of the vault in operation can be found here.

Refer to the 44 page Gringotts Mini Vault Build Notes PDF file in Documentation below for detailed assembly instructions.

3/18/25

V3 - Dial V2.stl file. Corrected Dial graduations. Now there are 100 gradulations (vs. 60).
Added Dial V2 Up.stl file as default. This file allows the dial to be read from above (vs. below). It simply flips the digits on the dial. The original Dial, which can be used if the Dial is above your line of sight, is still included as an “Outside” part in the 3MF, but must be swapped with the Dial V2 Up part on Plate 5 for printing.