A very good investment for me was the 1/4" foot with guide-(flange).Then using the same ruler, the same presser-foot, squaring up each unit as I went---it all added up to better blocks. But remember that fabric stretches or eases in as it pleases, sometimes. And a lot of it 'quilts out'. Don't obsess over EXACTLY same sizes, our grandmothers never had a ruler or rotary cutter, only a square of cardboard and a pencil! The board wore down and the pencil got dull, but they made some beautiful quilts!! Keep at it :thumbup: