In the book -the Da Vinci Code- a cryptex plays an important role. The cryptex is a cylinder with an important document in it, protected by a code word which can be set by turning rings around the cylinder. This thing contains the files to print the parts which make a fully functional cryptex which can be printed on a 3D printer.Three other cryptex designs are on thingiverse: http://www.thingiverse.com/thing:1751, http://www.thingiverse.com/thing:2695, http://www.thingiverse.com/thing:2708, but this design was started independently based on ideas found in instructables.com. The other thingiverse designs do not contain pictures and seem to have some design issues which probably means they were not completely finished.A short video showing this cryptex in operation can be found on youtube: http://www.youtube.com/watch?v=BjUNWvj0Q68The printer used is my repstrap printer which is documented in the blog: http://pasutx.blogspot.comMost parts are printed on a 3D printer. Several parts will need to be glued in place, the order is important. You should have a fully functioning cryptex now! This thing can be improved. The blender file is attached with all the parts in it. All individual parts are on different layers to make editing easier.