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One thing that I'm wondering is, about the materials used in the 3-D printers. Right now, they are limited to a certain kind of plastic, correct? So, the products they can make have limitations in function and durability.
Not really, there are various type of plastic, ranging from hard rubber to soft to hard plastic and can print various colors (which is PinA with our printers).
Now the only biggest pain in the neck is maintenance, when you are done with it, you have to clean it completely, all the tiny holes, surface etc. Can't leave any tiny speck on the surface due to close tolerance of printing.