MakerBot Replicator Z18 Spool Holder

I bought some PLA filament spools with hole 30mm diameter in the center. And the width is about 85mm. I used to use http://www.thingiverse.com/thing:615307 for larger hole spool, but 30mm hole is too small for it. So I use openscad to create a thinner pod (diameter 28mm). And this openscad is customizable. There are two variables control the diameter and length of the pod in beginning. So if you want any different diameter or different length, you can do it yourselves or ask me to make one for y