We are going to make this the same way as we made the rings, with a revolution. To start, create a new part and a new sketch. It consists of a hollow cylinder, with lips around the edges to hold the rings in place. This outer chamber holds the rings in place and prevents access to the contents inside the interior chamber. Having completed the rings, we are now going to move onto the exterior chamber. 07", to give it an easy to read surface, but still give the ring some strength. This will now wrap the text around the ring. Apply the Wrap to Face option, and select the outside face of the ring. Exit the sketch, and using the Emboss tool, select the text. Step 8: We are now going to emboss the text into the surface of the letters. This equation allows us to change the CharacterNumber parameter and easily change the password text. Without that -1, the text would be off by one character. The reason it is CharacterNumber-1 is because we want A to equal 1. ![]() The equation is (CharacterNumber-1)*FontSize. Then, we need to use the CharacterNumber parameter that we defined, and the font size to create the equation. First, create a dimension from the top of the A (again using the snap point) and the line that you just created. Once that is in place, you can move on to actually constraining the text. Then, create a line and dimension it so the distance to the projected center is one half the Font Size dimension (you can use the equation FontSize*.5 to achieve this). Project the center line used to create the revolve (you might need to use a work axis through the center of the ring). First, we need to get a point to constrain to. This should make A the correct character. ![]() This defines what letter is going to be used as the combination (ex. The second parameter is the letter number. This is a critical dimension, because we will be using it to create an equation to define the letter. Measure from the top of the A to the top of the B. The first parameter that we need to define is the total font size. This will allow the text to slide freely up and down that line, allowing us to create different combinations. Apply a vertical constraint from the top of the A (there should be a snap point available there) and the center line. Create a center line on the top surface of the ring. We now need to space the text equally from both sides. From there, I adjusted the font size until that measured dimension matched my circumference. I added an A after the Z, and then measured from the top of the first A to the top of the second. This is a critical dimension, because it wants to be as close to the circumference as possible. Choose your font, and measure from letter A, to letter Z. Step 4: This is where you get to explore a bit. Center justify the text to make it look neat. Step 3: Using the text tool, type the alphabet, inserting a space in between every letter. Step 2: Create a new sketch on that plane. Step 1: Create a work plane that is offset from the outer surface of the ring in the XZ plane (I spaced mine off two inches, so I could still see the ring without interference.) Because we need to make multiple rings, we are going to use parameters to allow us to quickly change the text on the ring. We are now going to add the text onto the surface of the ring. I used a Stratasys uPrint printer, which prints in ABS and a support material. Since the rings are printed on to the outer chamber with about a hundredth of an inch gap, and are inaccessible to clean out any non-soluble support material, you WILL need a printer that can print in a soluble support. Second: This print requires use of a printer with a soluble support material. Plus, there is writing on the side which you do not need or probably want. This Cryptex is a fixed combination, and thus, if I give you the STL, it will be exactly as shown in the images above. I don't believe you actually want the STL file. POST-INTRO NOTE ( PLEASE READ BEFORE COMMENTING): I have recently received many comments about getting the STL for printing. IF YOU ARE CURRENTLY SEARCHING FOR, OR PLANNING ON SEARCHING FOR, THE GEOCACHE CRYPTECH (GC3K7QE) YOU SHOULD BE FOREWARNED THAT THERE ARE SPOILERS INCLUDED IN THIS INSTRUCTABLE. If you are interested in making an exact copy of my Cryptex, please skip to Step 17 , which details modifying my files to edit the combination. This should include creating parts, assemblies, extruding, cut extruding, revolving, embossing, and basic parametric modeling skills. ![]() Basic experience with your CAD software of choice is recommended. It will use Autodesk Inventor 2012, and will detail the critical steps needed to create it. ![]() This Instructable is going to guide you through the critical steps to create a CAD file for 3D Printing a Cryptex. The pictured Cryptex is currently being used as a Geocache ( ) in Minnesota ( ). This Single Combination Cryptex has a very spacious interior.
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