as a machinist and fabricator for almost 45yrs,and still practicing today, if i need a "copy" of an item and don't want to pay list for something i know i can make, i go that route.
i know my skills will withstand whatever the intended purpose of the item will be.
i also am aware of the time it takes to make something outweighs the cost savings, but being on a fixed income, sometimes i have no other choice if i want something i otherwise could not afford.
just my life experience, your mileage will vary.