Summary

The orignal design chip holder was made using
http://www.thingiverse.com/thing:350083 by mathgirl

This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/imkCF3ihKnH

(I am not sure if the chip holders are the regulation size, it seems small but I don't have a chip (or a chair) in front of me now.