Only thing missing from these graphs (IMHO) is personal 3D printer ownership.

3D Printing
,
1

Only thing missing from these graphs (IMHO) is personal 3D printer ownership. I would expect that to be a hockey-stick curve crossing the others at around the 2-5 demand unit line.
http://www.shapeways.com/blog/archives/1933-Comparing-Apples-and-Oranges-Injection-Molding-vs-3D-Printing.html

2

I believe widespread access to 3d printers is going to push the demand for low cost injection molding services.

3

Make an accessory kit for the 3Doodler that turns it into a hand-held injection moulding machine. :wink: