Hi

Nylon gears in a drive train will ultimately distort and lock up simply due to moisture in the atmosphere. Will they all do it? Of course not. It depends enormously on the tolerances, the humidity, and the way they were cast.

Nylon will not instantly self destruct the first time water gets near it. Neither will ABS or PLA. Each of them has a set of solvents that you need to avoid for pretty much instant destruction. Water is not on that list for any of them.

If you want a funnel that will hold up to normal use and a wide range of solvents, don't use any of them. Funnels are a "dime a dozen" sort of item around here.

Bob