There are many cryptex models around, but this one can be set to any 5 letter word you want.

*** NEW *** If you have a larger print bed than my little 120mm one you can now print 6 or 7 letter cryptex! Just use cryptex_central_support_6 and cryptex_core_tube_6 for 6 letters and their _7 versions for 7. Dont forget to print extra letter rings.

NEW: Alternative skull end, a combination of the original ball end and thing:11953 - elvis the printable skull. Perfect for a pirate themed cryptex. NOTE: Print at 50% size to match the rest of the parts (CAD package would not shrink Elvis)

New2: Ring2 now features anti-pick features. This makes trying to guess the code by testing the resistance of the rings to turning much more difficult.

Folk who have already printed ring2 can add these features by filling 0.5mm groves into the sides.

Alternative ring1 added with reversed letters for easier printing. I found this more difficult to get a good paint finish, but I'm not too good with a brush. Print with inlay versions of locking ring and spacer ring.

The following instructions sound complex but does result in a very tight and well fitting cryptex.

Print 2 x cryptex_ends, 5 x cryptex_ring1, cryptex_ring2 and cryptex_spacer_ring, One of everything else. (except the assembly) I print all at lower settings (0.25mm layer) except ring1 (letter ring) which I print at as high a resolution I can.

Update: There are 2 versions of ring2.

cryptex_ring2: ring with anti-pick features on both sides, needs support

cryptex_ring2_ns: ring with anti-pick features on one side no support needed.

When assembling with cryptex_ring2_ns make sure the flat side is uppermost in the stack.

I have posted stl files of 5 off ring1, ring2 and the spacer ring for faster printing of a complete set

Make sure you file any rough edges, the better the finish the better the cryptex will work.

Snap a ring2 into each of the ring1's, select the letter required and make sure the gap in ring 2 lines up with the desired letter.

Glue one of the ends to the cryptex_core_tube, the open end into the end piece.

put the locking ring onto the end of the outer support and twist it into place making sure the gap in the ring lines up with the gap in the support tube.

slide the outer support tube and locking ring over the assembled core with the locking ring against the end of the core tube.

Assemble the rings onto the core tube and outer support tube in the following order: letter ring followed by spacer ring, repeat 4 more times.

Put some super glue onto the remaining end on the rim of the indented disk on the end and press the assembled cryptex against it to finish the assembly. Don't worry about gluing the end spacer disk to the end of the cryptex as it does not need to be removed for changing the word.

To reprogram, open the cryptex and take off the locking ring (twist and pull). Slide each of the rings off the support core. To change a ring's letter remove the inner ring and replace it with the gap at the desired letter. Reassemble in the reverse order.

This is my first published design, any comments are most welcome.

Enjoy.