Fine intake filter piece for my fluval 407. I wanted something I wouldn't have to clean as often as the smaller intakes but still shrimp safe.  This works on my 40 gallon quite well, and press fits directly into the Fluval 407 grey rubber connectors. Print hollow side up, and you can paint 1-3 supports halfway up if you're having trouble printing. I did not need supports to print.  If you print in PLA the part may warp over time, I have had more long lasting success with PETG.