Medical procedures often make use of plastic implants, like catheters and valves. These are mass market produced,in a few sizes to accommodate different patients, but still they are not customised to a specific patient. The production uses molding processes, these are very efficient in volume production but would be extremely costly if one were to use them for customised production. Besides, it would take a lot of time to set up the molding process for a specific person.
This may change in the near future thanks to the results obtained at the University of Florida by a team of researchers that have found a way to 3D print soft silicon. The results are reported in an open article on Science Advances. 3D printing can create an implant that is tailored to that specific person needing the implant and can do that in a matter of hours if not minutes. Also, consider that implants for children needs to be replaced frequently as they grow up.
An interesting perspective, at the edge of science fiction, is to be able in a not distant future to use customised implants as scaffolding to regrow organs, like the pancreas and the prostate. Scientists are unlocking the mystery of cells regeneration, specialisation and organisation (what it takes to grow an organ), are now getting closer to explain why a lizard can regrow its tail whilst we cannot regrow a hand… (it is about genes and their activation). This knowledge combined with technologies like this one may revolutionise medicine in the fourth decade of this century.