I have found other simple box generators, http://boxmaker.rahulbotics.com/ but found I wanted something more. My script has logic for screw assembly and for advanced users, gives you the ability to cut holes and modify the box,

Download the OpenSCAD file and change the following variable at the top of the script:

width - box width length - box length depth - box depth

tablength - the length of the tabs, can also be thought of as material thickness tabwidth - the width of the tab

tablengthperiod - the number of tabs along the length dimentions of the box tabwidthperiod - the number of tabs along the width dimentions of the box tabdepthperiod - the number of tabs along the depth dimentions of the box

screwLength - the length of the fasening screw screwDiameter - the diameter of the fasening screw

hexWidth - the width of the fasening hex nut screwhexThickness - this is more of the length of the hex nut, not sure why i called it thickness

exploded - when set to true, will render the plates ready to be cut out, when false you can see the box assembled explodedplateseperation - the seperation beween the plates when rendered in the exploded view

The values I have in the script work well for plywood that is 6 mm thick. I got the plywood from home depot. And I used 16mm long 3M screws.

There are sub function in the script (BottomPanel, TopPanel, etc) that represent each plate. In side each function is a basic Panel function, if you want to cut a circle or square out of plate just perform a difference method. The transformations are well setup so you can just use magic numbers in the BottomPanel function and it will translate well between exploded and assembled views.