How many generations can a RepRap reproduce before there are serious issues with print quality?

When you get a key copied, the locksmith usually asks if they key is an original or a copy. This is because the process of copying a key is lossy; each time you make a copy from a copy, detail is lost. After a few generations the key will not open the lock, and after many generations the copied key will be blank.

This is a companion discussion topic for the original entry at