There is truth to the uniqueness of certain requirements driving up expenses. When you want a specific toilet seat component https://www.washingtonpost.com/bus

There is truth to the uniqueness of certain requirements driving up expenses. When you want a specific toilet seat component https://www.washingtonpost.com/business/capitalbusiness/the-air-forces-10000-toilet-cover/2018/07/14/c33d325a-85df-11e8-8f6c-46cb43e3f306_story.html https://www.washingtonpost.com/business/capitalbusiness/the-... made to very some specific specs with a unit quantity of 1-3 with no inhouse production capability, and you need to reverse-engineer the existing one to make the new one, create a model, test it, research the initial design specs upon which it was based, etc., you're going to pay through the nose for it. Now, if you can 3d print it but have already done all the upfront work and have a great 3d design that has been tested, then you may be able to print it cheaply, but legacy military & aerospace designs may not even exist in CAD designs.