Lock Puzzle

A 3D-printed puzzle box written in OpenSCAD.

Usage

Rendering

1. Make sure you have OpenSCAD installed.
2. In the file render.sh, change at least the LENGTH variable to the length of your chosen password.
   • You can also change other settings such as the alphabet, or the diameter of the box.
   • The default diameter (and the one the printed model has been tested with) is 50mm. The lock mechanism takes 20mm off this, so the inner diameter is 30mm.
   • The length of the box currently depends on the length of the password, and is (LENGTH*10+15)mm. The length of the inner space is (LENGTH*10)mm.
3. Run ./render.sh, which will create all the STL files you'll need in the out/ directory.
   • If you are using an OpenSCAD version without support for the Manifold rendering engine, remove the --backend=manifold argument.

3D Printing

Print the following objects:

• 1 x case.stl
• 1 x plug.stl
• 1 x key_dial_${character}.stl for every character in your password.
• LENGTH x ring_click.stl
• 1 x ring.stl

Assembly

1. Start with the printed case:

   

2. Add the first ring to the case as shown here. Note that the outward-pointing position indicator and the sideways-pointing "clicker" must be oriented exactly as shown here:

   

3. Add the first dial case as shown here.

   

4. Repeat steps 2 and 3 until you reach the last dial.

   

5. Add the final ring to the case as shown here. Note the absence of the clicker.

   

6. Turn all dials so that the cutout lines up with the long slot in the case. Turning the dials might require quite some force at first, but after a few turns the clicker will wear down a bit, which will make the dials easier to turn.

   

7. Finally, insert the plug all the way, then turn the dials to lock the puzzle box: