Ergonomic Wedge for Thumb-Style Trackballs

This all started with a thread from Reddit, where someone had tried to identify a trackball that an editor was seen using in a screenshot. Turned out to be an ordinary Logitech m570 on a wedge. After some discussion, someone suggested it could easily be 3D printed, so I took that as an opportunity to teach myself how to design and 3D print objects.

The latest design, the MkⅦ, is the one I am currently considering the "final" version. At 25% Cubic Infill it is quite stiff and very stable, but