Can’t wait!!

I’ve bought the flexi stl yesterday and have been using the flexi cutter and designing my own things. Is there a best practice/list of rules you have for using the flexi cutter stl? Obviously not full course material. But just to make sure the Boolean works with it. I’ve had to play with it by scaling and resizing on different pieces to get it to work on smaller sections of the mesh. Is this correct? When things work or don’t work, I’m not Sure why lol. So anny other rules would be really helpful! Thank you again!