terry wohlers is a leading authority on rapid product development and 3d printing. great to see you, terry. tell me about the economics of it. so to buy a makerbot or put something on shapeways instead of manufacturing it the traditional way. >> well, it depends on the type of product, the volume, size, complexity. typically, if it's a relatively low volumes and very complex, then that's when there's a good match. and also relatively small. they don't do well with big parts because they take so much longer. you can do big parts by getting the expensive machines and assembling. it really is on a case by case basis. prototype across the board but when you go into production with these types of machines, you have to carefully evaluate the types of parts and volumes and materials, as well. >> how much does a makerbot cost about? >> it's in the range -- depends, they have more than one version. in the range of 15 up to around $3,000. there's many different. more than 100 different brands of that type machine, all the way down to as low as $200 up to around $3,000, $4,000.