Google repstrap
Primitive 3d printers that will allow you to print your first plastics for the next printer
But most dont bothere with this anymore, as plastics are now so redily avalable on ebay.
Also most place have fablabs or makerspaces with 3d printers you can access. Depending where you are.
Also some will print you parts for bear money, and some even print playing it forward (you have to print a set of plastic for free for someone once you get going)
Depends a lot on where you are, and how nice the people in your area are