I add all bug mm more than 1/4" seam allowance for EPP, justified easier that way. If using 1" hexies I cut a 2" strip of fabric, cut into 2" squares, then you can just trim off the corners, either ahead for time in stacks with rotary cutter or as you go with scissors. Make 1 & see what seam allowance works well for you then cut your strips. When making many I cut numerous strips, stack them & cut lots quickly.