Safe - Mechanical 3D Puzzle

Tax included

Unique wooden constructor by Ugears.

The construction kit has all you need for assembly: a set of high-quality plywood boards with precisely cutout parts, detailed step-by-step instructions, and additional details.

Size models in finished form: 7.7*7.3*6.9 in (196 * 185 * 176 mm)

Inside space of  the safe: The  W*H*D   6.1*5.5*4.1 in  (155 * 140 * 105 mm)

Package size: 14.6*5.5*1.6 in  (37*14*4cm)

Number of parts: 179

Estimated time of assembly: 6-7 hours

Material: Eco-friendly plywood


Safe from UGEARS - a godsend for those who want to try themselves in the role of a safe-cracker. A real, already assembled wooden safe has a full code lock with characteristic clicks when you rotate the handles. To open it, you need a stethoscope or a piece of paper with a code.

If you do not know what to do on a Saturday night or where to hide a gift to your beloved one, then a unique safe will be an excellent solution in both cases. Hide in the safe a cash prize and offer to play to your friends. Check who can open the safe, focusing on clicks or turning the knob randomly. It does not matter, the main thing is not to pry into a piece of paper with a code and explain in advance the lock work principle.

Multifunctional safe will become not only an attractive detail of the interior, but also a reliable place for storing valuables. Such a gift will not leave anyone indifferent! Everyone who has been lucky enough to receive a wooden safe will find a lot of ways to use it.

Rules of the safe opening:

At first you should renew code lock: twist the knob safe counterclockwise (left) to one-two turns. You can now dial the code:

1 - Scroll the knob counterclockwise (left) to the first digit from 1 to 9. Stay on it.

2 - Now turn the knob clockwise (right) to the number zero. After passing zero continue to twist the handle to the right to the second code digits from 1 to 9. Stay on it.

3 - Again turn the knob counterclockwise (left) to the third digit.

If the combination is correct, your safe clicks and opens itself  on  the third digit.

(Briefly rules: twist left to the first digit, then right  to the second zero digit and then left of the third digit).

How to create a custom lock combination for the model Safe?

Let’s suppose you would like to put the code 321:

A=3, B=2, C=1

(Technically number C - can be only 1, 2, 6 or 7)

P1, P2, P3 - plugs in the discs


P3 - P2 = B - A + 8 (mod 10)

P1 = P2 + B – C (mod 10)

where A, B and C are the digits of the wanted code.

Safe’s code formula for 321 code:

P3 - P2 = 2 - 3 + 8

P1 = P2 + 2 - 1

P3 - P2 = 7

P1 = P2 + 1

Just choose one with P2 and P3 being 0 to 9

In this case you should use matching method to find the correct values. As you can see, this system of equations satisfy such values P1 = 1, P2 = 0, P3 = 7 (plugs in the discs)


The model has everything you might need for assembly.

The quality of the details is very high – the parts of the model are outlined with a CNC laser cutter on a plywood board. The first thing you will notice when open the box is a pleasant smell of real wood.

The details have to be pulled out of the boards and assembled to create a complete model. Made out of high quality plywood, without glue or any additional appliance, your eco-friendly puzzle will bring hours of joy to the whole family and will make you closer than ever. Just follow the detailed step-by-step illustrated manual with instructions in 10 languages to complete your 3d puzzle.

Do not forget about educational value of Ugears constructor provided by the great mechanics based on the real-life designs. 

Data sheet

Number Of Parts

Specific References

You might also like