With all due respect, a 3d printing community is going to draw extremely low levels of bullshit.
Other communities are seeing quite a bit of tomfoolery already. Personally, I do not think attracting all internet denizens equally is a sound strategy for healthy long term growth.
That’s kinda funny. It’s still a barrier to entry though, as a niche, technical hobby. It’s going to get less crap than, say, a news community, which does not require monetary investment and some genuine interest to engage in.