I don't know the reason others do/don't like 3D printed plugs, but here are the reasons I don't like them.
1) Those that I've seen are more expensive than traditional frag plugs
2) Corals don't seem to like the plastic and don't seem to adhere/grow as fast compared with cured plugs
3) On some of the ABS plugs I've played around with, when I went to cut the frag plug (cutting the top in half, not the top from the base), the piece shattered in one case and in another case (I believe a different 3D printer plastic), the plastic melted and injured the zoa.
I don't know much about the properites of ABS or PLA, so I'm sure there are materials out there are easy to cut and are comparable in cost, but I haven't seen a material that grows as well as a traditional plug. That being said, I'm sure there are reefers that have a different set of needs where 3D printed plugs are much easier to work with or have benefits traditional plugs can't provide. I'm probably just not the target audience :)
By the way, I love your screw design- really creative and the plugs look fantastic!
