A few years ago I had and enjoyed a Mamiya C3 and could 'see square' admitidly crudely. The negs were almost always printed square - they sorta worked for me. In my complete stupidity I sold the camera to finance a Brony ETRC which I still have but rarely use. How I wish I still had the C3, bigger neg, no parralax error with the paramender, capable of good close ups with a little maths....

Re 'wasting' paper, surely you print the image cropped the way it works best. Any other way is a waste of paper imho.