I like to look at the past to predict the future. Case in point: some key patents to FDM printing ('glue gun' type) expired in 2009. Prior to that, the average cost of this type of printer was about 14,000USD. Now the average cost is 300USD, or just 2% of the costs only 5 years ago. The importance of this can not be overstated. Now, in 2014, key patents for selective laser sintering expired, and you can bet the same will happen to costs. The only question I have is can I pull enough energy to operate a laser in my home? To say nothing of the ignorant majority's fear of everyone printing a gun.