YouTuber Robert Murray-Smith recently published a 3D model of a so-called “magic wallet” on the Thingiverse platform. The object demonstrates an interesting mechanical principle known as a rolling joint. Originally known as a magic wallet, the concept stems from a simple mechanical trick in which two plates are joined together using flexible joints so that inserted objects can move between the sides.
The technical background to this effect is based on so-called rolling joints, special joints in which two surfaces roll against each other. Such joints are particularly common in biomechanics and can be found in the human knee or hip joint, for example. YouTuber Robert Murray-Smith now takes up the principle in his video and shows how such a joint can be easily produced using 3D printing.
The model uses 360-degree hinges that are created directly during the printing process. These hinges do not require any assembly after printing and are therefore ideal for complex movable structures. The Magic Wallet model and other examples, including the hinges, are available free of charge on Thingiverse. Interested parties can test them directly and adapt them to their own requirements.
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