Unless you have a particularly creative idea in mind, I'd suggest not messing with this design—after all, it was specifically tailored to add a touch of liveliness and lightness to my other gimbal design.

This tiltable stepper motor gimbal

https://www.youtube.com/watch?v=Gl1Zc-pcRZk&feature=youtu.be

Why not give it a bold remix and add a bit of playful charm? Hehe!

It is still under continuous optimization.

I have already printed out the model and finished assembling it. I successfully installed it on the frame. However, I haven't had a chance to install the flexible drive mechanism and the pneumatic suspension device yet.

Perhaps we should first take a look at the original design - the designer specifically chose ball bearings for the hinge joints, and I just happened to have some on hand, so I decided to use this design. In fact, I think it's entirely possible to achieve the same function without using bearings, and the effect would be just as excellent.
However, if you plan to print this gimbal yourself, don't be surprised to see that the size of the holes is a bit large—this is actually a deliberate allowance for easier assembly and debugging in the later stages.