A cross cut sled allows you to make safer, cleaner, and more accurate cuts on the table saw. Using scrap plywood that I had in my shop I finally built myself a cross cut sled. The most important part of the build is squaring the fence to the blade, and ensuring that the cleats on the bottom of the sled slide smoothly. As an extra precaution I added a blade guard to the top of the sled. Furthermore a guard was added to keep my fingers away from the blade as the saw exits the sled after a cut is finished.
Primarily the sled is a 3/4″x24″x24″ piece of plywood and a 20″ scrap of 2 by 4. The grooves in my table saw are exactly 3/4″ wide, so there are a number of different cuts of lumber (any 1 by whatever) that could be used to make the cleats.