This is a larger version of my elongated micro overflow. For several of our tanks, I needed something that could handle a higher volume of water, and that could still feed a centered drain, while straddling a centered air pump. I use 3/8" OD / 1/4" ID tubing for over the wall, and 3/4" OD / 1/2" ID tubing for the drain.

Print instructions

Print Settings

Rafts: No
Supports: No
Resolution: 0.2mm
Infill: 40%

Notes:

I also set 1.2mm thick walls because I've been having trouble on my printer with underextruding, which leads to leaking.

Post-Printing

Just to be safe, I also swabbed the inside of the baskets with a cotton swab coated with aquarium-safe silicone. This is mostly due to my setup having a meltdown and underextruding some surfaces.