Cryptex Chain

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This is my entry for #CHRISTMASXCULTS challenge. I love riddles and that's why I wanted to put my wife a very special Christmas present under the tree this year. The present can only be unwrapped if she manages to open the Cryptex first. To open it, she has to solve a riddle that I have placed in the gift card. There are no limits to your imagination when it comes to designing your very own riddle: Make a crossword Write a riddle poem Hide a secret message with invisible ink The cryptex has following properties: programmable and spring loaded letter and number rings no glue and no screws required (only printed parts) no support and easy to print 3MF file (already set for one or two color printing) adjustable length for chain (no limit) not possible to open without code How to print endless chain: Layer height: 0.2mm General speed: 200mm/s Outer wall speed: 60mm/s Position on built plate: middle front Print a single chain link and pause printer at layer 31 Put two chains into single chain link and continue printing Caution: Avoid collision with extruder Happy printing and merry christmas everyone :-)