This spool holder is based on NoiseReduction's spool holder (http://www.thingiverse.com/thing:67193).
My spools were not compatible with old dimensions so I modified it to fit and cleaned the mesh of the vertical part. I also lowered the back of the horizontal part as I don't need it to be so high. Makes the print easier and uses less plastic.
* Minimum spool hole size: 32mm
* Maximum spool hole depth: 100mm
* Allow full use of the available printing space