The PuzzeLock Box is more than just a container — it’s a fully 3D-printed puzzle hidden inside a working lock. At first glance, it looks like a simple latch-box, but beneath its 2 mm-thick false floor lies a programmable lock system built entirely from printed parts.

To open it, you’ll need to solve a sequence of steps:

1. Set the secret number dial (42 possible positions)
2. Spin the box to release the centrifugal latch
3. Slide the hinge into position
4. Release the main latch

Only when each step is done correctly will the lid unlock.
It’s part puzzle, part lock — and all 3D-printed fun.

Key Features

• 100% printed – no hardware, screws, or extra parts required
• Programmable lock system with your own secret number
• Unique puzzle sequence – every opening feels like a mini adventure
• Snap-together design with print-in-place latch
• Compact but useful: inside cavity fits cash, cards, small valuables, or even a phone
• Great gift or challenge – part puzzle, part secure stash

How it Works

• The Secret Dial (42 numbers) acts as a combination lock
• A Centrifugal Latch with gravity weights forces you to spin the box on a flat surface
• The Sliding Hinge Section controls both the dial and the latch
• The Latch Bar at the front is the final lock, only freed once all conditions are met

This layered system prevents “safe-cracking” by touch and guarantees that only the correct sequence will unlock it.

Specifications

• Usable inside cavity: 6.25" × 2.75" × 1" (158 × 70 × 25 mm)
• Outer dimensions: 6.6" × 3.5" × 1.1" (168 × 89 × 28 mm)
• Lock mechanism thickness: 2 mm layer in the floor

Printing & Materials

• Box & Gears: PLA
• Spring parts & False Bottom: PETG (recommended for flexibility & transparency)
• No supports required – built-in where necessary
• Print settings:
  • Nozzle: 0.4 mm
  • Layer Height: 0.2 mm
  • Walls: 4 (1.6 mm)
  • Top/Bottom: 5 (1.0 mm)
  • Infill: 40% Cubic (Box & Gears), 100% (Springs/False Bottom)
  • Orientation: as per STL/3MF

Included

• STL/3MF files
• Full 10-page Instruction Manual with step-by-step printing, assembly, and usage guide
• Clear diagrams and pro tips for smooth operation

Related Links 3-digit Logical CardLock Case - The Programmable Gift Card Case with a Twist 4-digit Logical CardLock Case - The Programmable Cash Case with a Twist BinaryBin – 16-Digit Binary Coded Lockable Container Programmable Combination Lock Gift Box StashCan 2.1 - 3D Printed Secret Safe with Programmable Lock Sequential Discovery Puzzle Gift Box #1 (GBS1) Centrifugally Unlocked Lock Box (BXC1) Locking Heart - Spin To Open

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https://www.logicalplanet.com/ email me at logicalplanet3d@gmail.com

Revisions and Updates I occasionally update and revise my designs. When I do, I’ll document the changes here. Check back periodically for the latest revision notes or if you’re experiencing any issues with a model.
2025-10-10: I have uploaded a revised version of the Box [100] with improved geometry, which should allow it to release more easily. The new design includes a new small piece of removable support, which is shown in the new PDF document attached. I have also significantly expanded the assembly instructions with addtional diagrams.