I recently noticed my LFS has started selling 3D printed accessories, aquarium equipment, feeders, etc. I myself have 3D printed lid clips + plant holders on my tanks but never thought of using 3D print for anything more than that. I'd never thought of its usefulness in aquariums before. What sort of 3D printed stuff have you made or seen for sale for aquarium use? Etsy and eBay also seem to full of listings for prints