I made this at TechShop www.techshop.ws
Step 1: Materials and Equipment
Laser cutter (my TechShop has a Trotec Speedy 300)
3.5" x 3.5" x 1/8" acrylic sheet
Bag of M&Ms
This instructable assumes some basic familiarity with CorelDRAW and a laser cutter.
Step 2: M&M Dimensions
Step 3: Design the Acrylic Tray
When drawing the circles and square, make sure you set the line color to red and the line width to hairline so that the laser cutter will know you mean to cut the lines rather than engrave them.