ABS will work, it's water resistant and very durable.

Quote Originally Posted by Alibert View Post
Nylon is made by a condensing reaction, that is a water molecule is split off to join two monomers together to form an amide bond. With the help of a water molecule that reaction can be reversed to split in into the monomers again.
I have also seen this with parts printed at Shapeways in nylon - in water they swell up and deform over time.
Practically, do you know how much the nylon will degrade and over what timespan?