EDIT: Here's what I initially thought... Hobbies would be anything hobby related, like videos on 3D printing, figurine painting, gundam kits, electronics, etc., while DIY would be for actual projects. So things like home remodel/repair and anything self-designed and self built. Does that seem correct?
Seems like this would be more for Gundam build kits and diy is stuff you'd make without a step by step instruction book.
So I'm guessing 3D printing stuff should go in DIY then? That's probably the majority of hobby stuff I'd be posting.
I guess? You could ask pina if it would be appropriate. Tbh I don't think either of these comms get used enough for people to care.