This is a fully parametric box plus lid that has a variable number of holes in X and Z for various jacks.

Download and use SCAD to change the constants to suit your needs to change the size and number of holes and box size. Hit F6 to compile. Then export to STL for printing. Updated to V2 to fix errors. Or better yet, open in the customizer (the server has been acting funny recently, so you may have to try several times).