This is a filament spool holder fixed from the top. It's ideal for a 3D printer case as mine : http://www.thingiverse.com/make:323522
Can hold a 90mm wide spool or two 45mm wide spool.

I printed it in PLA, with a 0.3mm resolution and 20% infill. But I recommand a 0.2 resolution for a better support.