Matt's Tray

This is a tray that stacks.
I cut it on a 30w Epilog Zing out of 3mm MDF.
Long story short... I've been using Legos to teach for about 11 years and during this time I've spent (or rather my school has spent) probably $50k on Lego kits. As you can imagine, this is a whole lot of Legos. If you have one kid with Legos, you know what sort of mess can be made. Multiply that by hundreds of kids and many, many times more Legos. I looked around for all sorts of inexpensive (because I spent all my money on Legos) sorting options. I found a few that looked like they might fit the bill but I couldn't figure out how to get them cut correctly so I made my own.
UPDATE (11-7-2014):
I modified the layout to try to minimize waste. The "improved" version fits on a 6" x 9.5" piece of MDF.