just yesterday I wanted to repair my phone but I needed a prying tool to pry some parts off of the chip. I could've just printed something like http://daydealx-com.s3.amazonaws.com/files/images6/prytool.j...
A week ago, something broke in the toilet (the refill valve I think it's called... a long plastic tube that refills the tank after a flush). I could've just printed a new one.
I also needed a screwdriver recently, and since domestic 3D printers will eventually be able to print metal just as easily as they can print plastics, I will be able to just print one.
And these are just recent examples off the top of my head...