Saltydog

I am new and have a monoprice select mini v2 printer and I have a geeetech A20M duel color printer. I have looked all over the internet, and I am trying to find the best settings for each printer, so I can set them to where an experienced person suggest. I have also tried to print on the A20 a measuring cube that holds water, so I got some PETG filament and printed a measuring cube because they say it holds water and the cube came up on each corner and leaks as bad as when I used the PLA filament. would appreciate any advice on the settings for each machine and the PETG filament. Thanks