[caddemon]

Yeah I'm not sure if there is an "ask" style subreddit for 3D printing, but IME the ask subreddits are a good way to get quality content on a broader academic topic.

There may also be a sidebar on a given sub with more specific related subreddits listed out. These can sometimes be more technical (for example there is a subreddit specific to breaking down NFL plays) or sometimes they are just a way to get a more specific viewpoint (I like to check out both teams' subreddits after some controversy happens, neither side is usually level headed but then you at least get both sides of the story).