A 3D printable mecanum wheel. The stl files are for a wheel with diameter 100mm and width 40mm. The design is parametric so it is possible to modify some dimensions of the wheel and it will update automatically.
I shared the Fusion 360 design: download and open it with Fusion 360, take a look at the "How to" canvas inside the project, modify the parameters in the parameter table to obtain your custom wheel.
Here is the link to the 360 Gallery project