About this 3D model

I got tired of tripping over spools of filament in my office. I borrowed the concept from a design I saw (http://www.thingiverse.com/thing:51635) but made it lighter and faster to print. And prettier too. :) The rod is a SS 3/8in 24in long. (you can get rods and nuts from Home Depot/Lowes etc. or online at http://www.McMaster.com) I simulated the tower in Solidworks (files attached) and it should be able to hold up to ~100lbs total between the two towers. I recently added a second tier to mine and it works great tool (http://www.thingiverse.com/thing:94691)