Long axis titles on 3D scenes overlap the tick labels and data, because they're simply centered on a point outside the axis and not rotated:

Our test images don't include a lot of long 3d titles, but you can see this effect a little bit in gl3d_world-cals

Feels like the easiest solution - which is also consistent with our 2D axis titles - would be to rotate these labels parallel to the axis. But potentially 1-letter titles ("X" etc) should remain unrotated?

The degree of overlap also depends on the viewpoint, so the logic for where to put this relative to the axis line and tick labels probably needs a bit of adjustment: