OpenSCAD version of https://www.thingiverse.com/thing:2562937, which allows to produce box of any heigh and count of slots you like. Another script allows to create one large slot of given size (for PCB, for example) and fill the rest with predefined amount slots.

Has two scripts:

1. BoxRegular.scad is a NxM grid
2. BoxSizedSlot.scad creates one slot of given size and fills the rest with uniform slots of given amount.

Github of those files is here: https://github.com/Shmuma/openscad/tree/master/Boxes