Here's some of my spaceship crew. They are all Stargrave figures and lovely clean sculpts.
I was trying some different sized bases as 25mm can be too small so I 3D printed 27mm bases, which I used on the 2 right figures, but I think these are too wide, and I will stick with 25mm or 26mm bases. Surprisingly the extra 1mm diameter of base makes quite a difference to the look and there is no bevel on the 3D printed base.

