I made this as a very simplistic way to support a spool of plastic over my RepRap, since I'm short on desk space.
It works just fine with charlespax's nice cardboard spool design:
I have now also designed my own printable spool that will fit on this stand:
The slot at the top takes up to a 10mm shaft, while the slots at the bottom are sized to grab hold of the top 8mm studding on a RepRap Mendel.
It's designed to require as little assembly as possible, and you should be able to make one out of wood too, although that might be a bit wasteful, as it's also designed to be lightweight.
If people really want it to be secure on there, then I'll make a design with flanges to bolt on with something like a y-bar clamp.
The included bushings are for gluing to a cheap cardboard spool so that if you use threaded rod it doesn't cut away at the cardboard.
Print out two frames, do any cleaning necessary on the bar slots, sit them on top of the reprap, put a bar through your spool and rest it on top of the stand. Easy peasy.
With the latest (1.3) design, you can also clamp the stand in place with bolts instead of zip-ties or string or whatever else you might use with the others.