Thanks for your reply Gambo.
I suppose the thread vs holding power for various materials is what is needed here but I recall from reading years ago that it gets pretty buried in equations and not altogether useful-hands on experience like yours is useful. I am never confident in the holding of PLA threads due to the layered buildup nature of the parts.

You are working with nylon-something I always wanted to try--it looks to be a lot stronger and more temperature resistant than PLA and apparently the layers have better holding strength. It is advertised as printable in the low cost desktop machines that a lot of us buy--not sure why it isn't more of a standard.
Do you post treat the nylon assemblies? I know that PLA leaks in water (I do a lot of aquatic work) and usually is pre-treated with methylene chloride to meld the layers. I forgo printing and use a desktop CNC and delrin for cases like that.

thanks
Fritz