This is a puzzle box that I found fun to use at Christmas time.

First, the key does nothing to open the box. It is only a decoy and has a pretty simple maze to pass through. To open the box, set it on a flat surface and spin it with enough force to cause the pins to move to the cavities in the bottom section.

Modifications:

I have included STL and STEP files so you can modify it as needed. Please link your modifications back to mine so I can see the interesting variations you design.

I hope you, your family, and friends have fun with this puzzle box.

General Details:

• Insert 4 pins in the cavities of the bottom part. I recommend doing this on a flat and stationary surface.
• Insert the top part into the bottom part. There is a chamfer to help push pins back into the bottom cavities.
• Lay the key in the indention on top.

Printing Details:

• Solid Fill Plate:
  0.20mm Strength setting
  Sparse infill: 100% rectilinear
  Enable support: Yes
  Type: Tree(auto)
  Style: Tree slim (advanced mode)
  On build plate only: Yes
• Bottom Plate:
  0.20mm Standard setting
  Enable support: Yes
  Type: Tree(auto)
  Style: Tree slim (advanced mode)
  On build plate only: no
• Top Plate:
  0.20mm Standard setting
  Enable support: Yes
  Type: Tree(auto)
  Style: Tree slim (advanced mode)
  On build plate only: Yes

Notes:

• The top plate setting leaves some stringing in the key maze. I was able to carefully run a key through it a few times and clear it out. I did try to use support and it was next to impossible to remove.
• I printed an extra key (in case of impatience) and 4 extra pins (because they are easily misplaced) and gave them to the gift recipient.