Spider: Bowden anti-bending PFTE tube cardanic system

thingiverse

Here's a solution for those struggling with PFTE tube bends or twists in bowden systems. The goal is to enhance the angle of the tube throughout the entire impression area due to the 3D movement of the NEMA motor and extruder, thanks to the cardanic system, which will prevent forced angles of the tube resulting from this free movement of the extruding system. This will make the sliding of the filament smoother and eliminate extrusion problems. The central position of the extruder allows for shorter PFTE tubes that can be cut more accurately to assist with the filament. The rods must be adjusted so that the extruder is near the center of the bed. You can design your own adaptors for rod terminations to fit your printer, or you can use one of my own designs if you're not familiar with 3D design. To balance the extruder system, move the NEMA17 mounting until it's properly situated. Use M3 screws and nuts (conical head is preferable) for the axis and 683zz ball bearings. Print one ring, one NEMA17 mounting, eight units of 6mm rod adaptors (one for each end of the four 6mm rods), and four spacers. The Spider cardanic system was designed to fit perfectly in a 200x200 3D printer bed. Thanks to XodrateP from the Tronxy Spain Telegram group, this design is based on one of his ideas.