That remains to be seen;-).How these do printed parts hold up in water, as in do they expand? Some plastics do and in some cases changed tolerances destroyed the reputation of the product with triggers jamming, e.g. the "Pelaj" speargun. Admittedly the tolerances should not be such a problem with a loose fit item like a line release finger. Also although not subjected to much load you don't want an accidental bump snapping the line release finger off if impacted from contact with another object.
But if I do get a resin printer, I will surely test this and perhaps try to leave some parts out in the sun for a long time, too and then break them later. The test hooks shown in some of the previously attached videos would be easy for me to replicate and I have a manual "torture bench" already which I have been using to test breaking strength of dyneema lines and pull force of rubber bands in the past.
I know some nylons are incredible hygroscopic and can absorb a lot of water leading them to swell and go soft, too. From memory, it might be something as crazy as a 7% increase in weight(?) that they can take on this way. I actually did print some nylon parts on my filament printer and when they were dry they seemed strong and stiff, but just a few days later, you could feel that they had gone softer. I didn't weigh or measure how they had grown or how soft but it was very obvious.
My hope, of course, is that the tough resins are impervious to oil and water. And if they don't like prolonged UV exposure, I guess I could coat them with a UV blocking top coat.
All this is stuff we need to figure out along the way.
For now, I like the increased accuracy, the smooth surfaces (for o-ring sealing) and the allure of resins possibly strong to make functional, structural parts.