Quote Originally Posted by uncle_bob View Post
Hi

The biggest issue you are likely to run into is that the plastics we use in filaments all will "age" quickly in water. The dimensions will change and that likely will impact your part.

Bob
what's your evidence for that ?
Commercial parts in cisterns also age - why should 3d printed parts 'age' any quicker ?

It just seems like water will seep through the lines and break down over time.
neither abs or pla are water soluble.
Pla can be digested but you ned a 'hot' compost heat and the right bacteria to do it. For any purpose that isn't inside a hot compost heap - it's pretty bomb proof.