An experiment has been done with an infertile rat, this rat gave birth to a healthy offspring due to 3D printed ovaries. The new ovaries were inserted into the infertile rat.
 3D printing also helps researchers study evolution of animals that took place millions of years ago, and helps study the origin of life. For example, a couple of researchers from UMASS Amherst, a public research university, used 3D printed replicas of 200 year old mammal teeth. This was done to study the evolution of the earliest mammals. They wanted to prove "the ability for teeth to damage prey is the most significant factor in the shaping of teeth". The 3D bioprinter helped these researchers find how the predators teeth changed over time. 3D bioprinter is not only used in the world of medicine, but also in other fields too.

This would be very beneficial for medical purposes. If someone needs a nose transplant, instead of waiting for transplants to come in from other countries, the hospital can manufacture the part domestically. 

Prosthetics come at a lower price when they are printed. Prosthetics are changing lives because they’re coming with the latest technology that people in the past would not have. 
Cellink, which is a 3D bioprinting company, launched its first bioprinter in early 2016. This swedish based company created the first standardized bioink. The bioink is made of  nanocellulose alginate, which is extracted  from seaweed. Cellink is trying to reduce the price of these machines, so they could be more affordable. This is one of the many companies that are trying popularize 3D bioprinting.