"Frictionless" PLA spool holder

It's a remix of http://www.thingiverse.com/thing:128387
I have another Spool Holder and another Spools of PLA :)
So, I created similar model in openJScad and print it.
My rod has 16.5 mm diameter and spools are 38.2 mm diameter.
Funny, but I had to print different sizes models for one spool. It's different on both sides.