![]() Wall thickness of the Dial Cylinder: radius of 31.25mm, 100s.Gap between prize cylinder and Dial Cylinder: radius of 28.25mm, 100s.Wall thickness of the prize cylinder: radius of 28mm, 100s.Inside of the prize cylinder the open space: radius of 25mm, 100s.Here is a list of the dimensions that we used in this design. These rings were all drawn using the Circle Tool in SketchUp. If I am printing this again, I would increase the gap size to 1mm total. During dry fitting, we had to sand our parts a lot to make them fit. For gaps between parts, we arbitrarily chose 0.5mm. To make sure all of the parts fit together, we drew all of the part diameters as a 2D cross-section (see picture). (It is actually about 1-5/8”.) So, to make an easy starting point, we chose a diameter of 50mm. For this, we decided a toilet paper roll would be a good size. The first step is to determine what size we want to make our prize container. In SketchUp, we chose the “Product Design and Woodworking – Millimeters” template. If we designed the object as 2”, the printer will read this as 2mm. Our printer reads everything in millimeter (mm) measurements. One more explanation before we get into the meat of it. Here’s a good page with explanations and links to the different packages available: There are several other software packages available for developing 3D models. Here are some links to the software packages we have used: STL has also allowed my brother and I to work on the same project, even though we were using different software packages. But, there is a Plugin available that can create. SketchUp 8 does not support these file types. This design was done in Google™ SketchUp 8 on a Windows 7 computer. The Dial Cylinder with 7 Code Dials and a Keeper Ring (The bicycle lock Barrel Lock).The Prize Cylinder with Lock Posts (The bicycle lock rod).So, with this in mind, let’s define our Cryptex parts. With the right combination, the posts slide by all of the dials, thus opening the lock. When locked, the dials keep the lock posts from sliding past. The rod with the lock posts slides into the barrel lock. ![]() One end of the cable has a rod with lock posts sticking up, while the other end of the cable has the barrel lock with a few dials with numbers. The best way that I can think of for describing how a Cryptex works is to compare it to a bicycle cable with the combination lock. Computer with 3D designing software, such as Google Sketchup or TinkerCADĪ Cryptex is a combination lock with storage space inside for hiding something.It is very cool to be able to do this as we can share the workload and modify each other’s work without ever sitting down together. I should mention that my Brother and I live in different states and share 3D files all the time with only one printer between us. We found a good picture to help us better understand how a Cryptex functions and used two free shareware programs between us to build the files. They were too small, did not have the full alphabet, or were not easily editable. We did not find what we were looking for online. We also needed a design that can be printed, molded and assembled in separate pieces so that the combination is easily changed for the intended recipient. For instance MIKExxx vs GREGORY (“x” illustrates the blank space on the wheel). We built our Cryptex with 7 wheels which will cover the size of most names or nicknames. To solve our problem we added a blank character to our wheel. This presents several challenges as not everyone has the same number of letters in their name and we did not want to build several bodies to accommodate all of these name lengths. We also wanted to be able to make a Cryptex for gifts where the person receives a Cryptex with their name as the code. We wanted it to be easy to replicate and build the Cryptex with more durable parts and without the long print times. This is an original design that has drawn inspiration from others. Designing, Printing, Molding and Casting. We will go through all of the steps to do this. There are several Cryptex designs on this site already, but we want to take the idea past just the design and printing stages. We have chosen a Cryptex to illustrate this process. This Instructable is to illustrate the process of taking a concept through design and prototyping all the way to small scale home production.
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