A community dedicated to the discussion of 3D printed guns and related topics.
Lemmy
Unfortunately this community has basically no engagement. But perhaps a few of the followers are still active.
There's also !fosscad@lemmit.online but thats basically the same story. Just a bot that scraped r/fosscad and reposts. But again no engagement and an even smaller base.
In my experience, communities are closer to hashtags than subreddits, if something is relevant for an instance then it will get attention when it's posted to. People scroll instances or all, not communities, usually.
This is true and it works pretty well due to the lack of an algorithm getting in the way. I am not subscribed to this community, but the last 2 posts for it did show up for me on my local page, so you are correct when you say that if it is relevant for the instance users, they will engage when they see a post.
It's nice that dead communities aren't ever really permanently dead like on reddit or some such in this regard.
Yep, that's how I found it too! A big advantage of federation and local scrolling.