Understanding the difference between common standard printers and a 3D printer is best with knowing what each of them were, before comparing them.
The Stratasys 3D Printers are professional system that is manufactured for everyone in form of shapes and sizes that satisfies the users.
An open source 3D printer has different designs, and some are simple. This normally require fewer materials than most of other 3D printers. It has a frame that can be made from a single 4’ long or longer, and about a 2 and an half square tube, then 14 guage/1.5mm/about .0598, and it is very cheap. This is a design that has fewer plastic parts, and still build a structure that is stronger. It has wires, but they are all hidden. Some people finds the finishing of a unit to be more appealing, after it is finished.