THIS IS A STEP BY STEP PROJECT, PLEASE READ ALL THE STEPS BEFORE YOU COMMENT!
If you do that I'm sure we'll get along famously.
This is an internal mix snowgun, meaning that the air and water mix inside the plumbing. Because they mix inside the plumbing there is a risk that the air may back up the water, or that the water will back into the air lines. I recommend using check valves on both the air and the water lines (not shown) in order to limit this risk.
The author, instructables.com, and any supplier mentioned in this instructable is not liable for any damage or injury that result from following these instructions. Please know that with all do it yourself projects there are inherent risks which may or may not be foreseen, and that precautions to protect yourself should be taken throughout construction and operation of the snowgun. You will be working with high pressure water and pressurized air, both of which can be dangerous, please wear hearing and eye protection when you are using your snowmaker.
These plans are more detailed, but for a printable copy either print these plans online, or visit http://www.makesnow.net/FreeSnowmakerPlans.php for a selection of home snowmaking plans.