After hearing about a great new technology about two years ago, Fool contributor Matt Thalman has patiently waited for what seemed like an eternity for a pullback in the share prices of a few companies that operate in the industry. Now, a recent decline in the shares of 3D Systems (DDD 6.65%) and Stratasys (SSYS 2.15%) gives him a better entry point into the industry, but he's waiting for one event this coming week to unfold before pulling the trigger. For more details, including whether you should be watching these stocks as well, check out the following video.