Was given an old Hohner B2A FL electric bass guitar and loved it except for the humbucker frames, since I am used to J-Style Pickups where I can rest my thumb while playing.
So I took the dimensions and added a subtle amount of material to give my thumb a comfortable support. Maybe it works on regular STEINBERGER basses too, since it is a licensed replica?
Printed mine in ABS and smoothed it with acetone, so it does not compromise the feel and look of that high polished instrument. Have fun!
Devil Design ABS
The higher your printing resolution, the better it will come out after acetone smoothing.
Had to print it with a little brim to make it stay on my Tornado, maybe you do not have to.