Fully Printable Mecanum Wheels

thingiverse

Print four to eight spacers based on desired rigidity and two mech plates per wheel type for a single wheel or 16-32 spacers and four of each mech plate for a complete set. Also, print 48 rollers for a full set. To assemble the wheels, use at least eight #2x8mm screws per wheel to attach the plates. You can hot glue them if preferred but screws offer stronger support. These screws can be purchased on Amazon for $3 for 100. Print the rollers in sets of 12 and sand them down for a smooth finish. To attach the rollers, use 1.75mm ABS rivets following instructions from this YouTube video (http://www.youtube.com/watch?v=WqNxYHWpYko). When printing out the plates, use full support to accommodate the bent "petals". The process of clearing away support material is time-consuming but worth it. These wheels are compatible with servos as the larger holes suit a servo horn which can also be mounted when screwing in spacers. Ensure there's at least one millimeter space between roller face and petal face for smooth rolling. Note that the screw size for 3-inch wheels is #2. Original CAD files for 8-inch mecanum wheels from AndyMark can be found on http://www.andymark.com/Mecanum-s/53.htm. These were rescaled to approximately 3 inches and the stl files are sized appropriately for servo-driven robots. The Autodesk Inventor assembly file is also available for rescaling or use in your own CAD modeling.