Safe Box

by blincoln, published

Safe Box by blincoln Mar 20, 2013

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A small and handy safe box with a built in combination lock. The whole box prints preassembled (inspired by emmett) including hinges, the only thing to add are the combination lock dials and rods which easily slide into position.

Two hexadecimal dials ensure a completely safe solution with 256 different possible keys (that is about as safe as WEP). Choose your own favourite key!


Print at fine resolution. Carefully push the two box halves to close the box until the hinge breaks free of any stuck plastic and moves freely.

Print two dials and two rods and place one dial on each rod. The flat surface on the rod closest to the dial defines the lock open position - choose this to match your favourite code. There is actually a small 16-facet part of the rod (yes, very close to completely round) and this is where the dial should be (the inside of which is also 16-facet).

Do not forget the correct key. It will probably take you up to 60 seconds to retrieve it otherwise.

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i cant dowlond this files

click you must, the download link.

The rods just spin in the dials, I guess glue? the description mentioned that it was 16 sided, maybe my slicer smoothed it out. so much for being able to change the combo at will.

Mine is not closing, does anyone else have the same problem? I don't understand where to put the rods, the instructions are completely unclear. How do we fix a combination. Can anyone help?

does it need support?

Dec 16, 2015 - Modified Dec 16, 2015

how does it lock? i haven't printed it yet, but i just dont see where the locking mechanism is or how it works.

Oct 17, 2015 - Modified Oct 17, 2015

Really cool print, but yikes the download links are messed up Thingiverse. Can still download the zip fine, but if click on individual links get this nonsense:
solid Union_399278
facet normal -0.000000 -0.707107 0.707107
outer loop
vertex 32.697395 2.120497 39.422222
vertex 32.697395 14.820251 52.121975
vertex 27.697395 2.120497 39.422222

If you get that page, just press CTRL+S and save the file. Make sure it's saved where you want and as the filename.stl

That just happens every once in a while with certain browsers.

Would it be possible to enlarge it?

how long does it take to make and are any supports needed?

Wait, what's the code?

what ever you make the code

Dec 17, 2014 - Modified Dec 17, 2014

I am guessing so but would like your opinion.
Will this work properly @ 150% scale?

Do I need supports on the rod holders?

How do I download it? I press download and it takes me to a screen with code on it.

Click download all, and it works.

press download all

Or right click (control click on mac) and hit save link as

what is the code to unlock it?

whatever you set it to!

Brilliant! If I printed it again I'd add a groove on one of the halves and an inverse on the other so the two halves lock together and don't slide side to side.

Do you think you can make another like this, but in the shape of a folded wallet? Basically a wallet sized safe.

will this work with 75 scale and 0,2 layers? lock 0,1

The hinges will likely stick and break when you try to move them if you scale it down, since it prints preassembled. But give it a try!

Rescaling worked on the Up Plus, printed fine. See picture of the red one in ''Made''. I painted the little numbers and letters blue, the picture reveils the ''secret code'' I used.

Nice! Which scaling did you use?

I believe I scaled it down to 80 %, printed with 0.15 mm layers.

What did you design it in?

It was designed in ViaCAD 2D/3D which is very good value for money. It is a budget version of SharkFX so the file formats are interchangeable.

Looks awesome. Going to make one tomorrow.
This would be a great thing for 'customiser'!

I agree, I am just not friends with OpenSCAD yet! Still hoping for a better scripting 3D cad alternative to appear, perhaps FreeCAD will make it some day?

I just started looking at FreeCAD myself as an option for 3D CAD on Linux, and as a parametric modeling tool, while it's no SolidWorks, looks to be pretty usable already (ver 0.13). I haven't tried any Python scripting with it yet, but the API appears to be full featured.

SolidPython is also a nice front end to OpenSCAD. I can script geometry in my Python IDE (I'm using PyCharm) and with OpenSCAD in auto-update mode, my changes in the Python IDE are immediately reflected in the OpenSCAD rendering view. Pretty cool!

PySCAD is quite nice. It gives OpenSCAD style modeling but with a vastly nicer language (Python). There's a java equivalent just posted on Thingiverse, too.

This was one of the first things I made on our printer. Highlighting the numbers on the dials (i.e. by rolling on a stamp pad or with a Sharpie) makes the digits really stand out and look sharp.

I'll do that when I make mine.

Good tip! I have tried various filaments for the dials but it is hard to get good contrast in the numbers with single color.

VERY nice. Great work blincoln.

Sweet. This will be the boxes I use for christmas next year when I give the traditional wad of cash to my nephews. I might re-draw it and add another dial or... five to mess with them though :D

Just so you're aware 256 bit WEP connections use a key that is 58 digits long. That's a whole Hell of a lot more than 256 possible combinations.

Cracking WEP takes about 60 seconds (even at 104 bit key length) - that is similar to the time to crack the code of this 8-bit box :-)

It would be interesting to try to get more dials into an as small box as possible to extend the key length. Hmm - with dials on all four sides of this box you would effective need to open three of the sides to open the box. That makes 6 effective dials and therefore 4x6 = 24 bit = 16.8 Million combinations.

Too bad it would only take a hammer to open it using an alternative method...

Heh. Good point about the hammer. So you just have to be more secure than that, not really comparable to WEP. :-)

Could you post the small box as a "stl" file so I could format it in makerware myself, would be a huge help.

This is just the naming of the ViaCAD file - this is the small box in the stls. There used to be a bigger box with three dials on my drawing board but that did simply not add anything to the concept so I shrunk it.