Filament holder. My lasered design.

I got this idea from the following thing: http://www.thingiverse.com/thing:16412

This gave me the idea to design a similar model with 5mm birch plywood.
I added the following features:
1: Made the base length longer.
2. Hole in top to guide filament through if needed.
3. Large rectangular hole in bottom so that it can be set up higher or on unit. Not seen in photo, but in the file.
4. 1.5" high end supports for added structural integrity.

NOTE: There is only one of the side