I'm not really sure where to ask this question as I think it is a design question, but also a printing question. So if there is a better place to post, I'd be happy to harass someone else.
I'm (re)designing a sprinkler manifold for a dripper system because the stupid pegs for this stupid manifold are on top of the manifold, which is a prime spot for any old postal person/dog/raindrop to break off. Of course the pegs aren't sold separately so you have to buy a whole new manifold. Seems like a great use for a 3D printer.
I designed a new manifold and decided the pegs were useful in case they broke off. I was thinking having them screw in would be a better design, but for the life of me I can't get them to actually screw in after I print. Here is the fusion 360 file. This is generally what it looks like: And here is the resulting stl file.
After several prints, the pegs won't screw into the manifold base. I push and I turn and turn but the threads just won't bite. The 3/4" pipe threads fit just fine, so I know threads can be printed, but these pegs are stubborn.
I guess my question is, what's a good design for a peg thingy that needs to attach into a manifold, but also pass water? Should I try to replicate the cantilever thing they have going on, or is a screw better? Any ideas why my pegs won't screw into the base of my mushroom? This is my first attempt at 3d modeling so I'm not totally familiar with all the terminology, so any pointers there would be helpful. Thanks!