I edited the design to add a print in place spring to open. nothing to see from the outside is different.
it is a plastic sping, depending on what material it is print out of will change how long the spring is good for. it is best to store the parts open. Even if the spring has taken a set to close it might open back up and work fine. The spring set does not prevent it from use. It just might not auto open.
All plastic springs if left compressed will loose their spring. A little spring open is much better than none.