One of the ways Prusa gets the quality they have is that they run a massive print-farm of their own printers to print the parts so they get to see all the issue

One of the ways Prusa gets the quality they have is that they run a massive print-farm of their own printers to print the parts so they get to see all the issues up close. Printing the parts also makes them upgradeable and home-fixable for end-users.