Another step of the open source 3D printing revolution might be to merge personal fabrication and distributed manufacturing.

Someone produces a model of a custom part that he/she needs produced and then asks the community to produce it (an example of this at thingiverse, a custom part made by Ponskaartje.

I think this is a very nice idea that might get the 3d printing/personal fabrication revolution rolling even faster.

Also I hope that we will start seeing more of this and perhaps even a marketplace that can make this happen (where a user asks for a part and sets some limits on it, and users might bid on making this part) like the sites where for instance programming tasks are put up and the developers have to bid on the task and the one asking chooses the best option.