This has improved my water flow so much. The water in the pool just circles around and around now. I use this with a 2100 GPH pump on a 15x48 Intex Ultra pool.

This one is longer than the original and when slicing I lowered it to remove the bottom lip. You can print it with or without the lip. It's held in by friction and I can easily turn it to point where I'd like. I point it more downward when I have my solar pool cover on it. I point it slightly below horizontal when the cover is off and I can point it upward when I need to cool the pool water off. Works great!

Note: 116% worked for me but you need to figure out what works for you. I did this by just printing an 1/8" section of the bottom and testing it until I got the right size. Enjoy!