I like printing square! Of course, you should know that I'm a complete square. Makes keeping the car in one spot easier! Ha!
I don't have any waste. If it's 8by8 from an 8by10 then I have a test strip for the next print. Same with other sizes. I keep the trimmings to use as test strips. Square mats & frames look rather unique and it's something I offer that you can't find at many places.