With regards to all the above posters , and Rob himself , I would not go too far down the route of adjustable pickup placement . Whilst it is wonderful from an engineering point of view , it is yet another variable to deal with . I can honestly say that at no point in my life , ever , have I thought that if only my bridge pickup was 5/16 of an inch closer to the the bridge , my tone would be perfect . Stick with the original plan . Is it possible to make a 3d printed bass that is playable ? And also beautiful , sounds good and is easy to play . 👍