First fembot in my collection, as usually, doesn't transform, but faithfull to comic as figure can be, no 3D printing, all hand made. If she would be build more traditionally, she would be carved in wood
I use Lego ball joint- standard "bionicle" ones and smaller, available in Mixel polybags Back in the days I used joints from TF-junk, but Lego ones are more consistant and easy to get source