This is inspired by Bluelinegecko's tool holder.
http://www.thingiverse.com/thing:406938

I deigned this rack to match my Skewer Holders curves
http://www.thingiverse.com/thing:430119

I also included a place to put a 5.5mm wrench to tighten the bed leveling lock nuts, you can find the wrench I based the size off of here.
http://www.thingiverse.com/thing:130949

This tool holder fits tight, I found the best way to install it was to hold your breath and put it on fast so it does not break.