This a a HOG or "Hemispherical Omnidirectional Gimballed Drive". I made this for our schoolproject on the PXL Hogeschool.
Video at: https://www.youtube.com/watch?v=keSnkupPV9U
I now made a version that supports bigger motors(25mm). The gimbal is updated so the inner part wont touch the outer ring anymore.
There are multiple files in the folder. Basicaly there are two models.
The first one you can print in two ways. You can print it in two times, but you will have to assemble it. Or you can print it in one piece (if your printer can handle the bridging).
The second model I have not tested. It should work, but the servo who controls the inner piece doesn't turn. It could be that you need to write some more complex code to control it propperly.
The third model is the addapted model for the 25mm motors