Parametric drill bit stand

I had various drill bits of unusual sizes in my toolbox, so I have decided to make a parametric stand for them in order to see their diameters instead of measuring them one-by-one all the time. The thing can be easily customized for different diameters and number of rows. See the instructions.
I used DroidSans font imported to OpenSCAD using http://www.thingiverse.com/thing:9126, and an algoritm for precision sizing and shaping 3D printed holes, as described in http://hydraraptor.blogspot.com/2011/02/polyholes.html and http://www.thingiverse.com/thing:6118.
The OpenSCAD source can be edited to create a stand with different number of rows or for different drill sizes.



Instructions
Modify the "sizes" array near the top of the openscad source. Modify the sizes_max value to contain the maximum hole size used. If you use a different number of rows than four, modify the row_y_offsets array accordingly. And choose the width of your stand (total_width) as well.
There is no need to modify any other parameter, except probably the item_height, which is the height of the first row. Height of other rows is derived from the first row height and angled_height variable.
I have printed it with 10 % infill and three top solid layers, but it is barely enough - the top layers do not stick well to the sparse infill, and only the third top layer started to appear solid. Four layers or bigger infill would be better.