For LC quilts whose logs are bigger than 3/4" I never use foundation. I tried making a Christmas wallhanging - a star made up from 16 LCblocks - with 3/4" logs and my blocks were so wobbly - didn't have a walking foot then. So resorted to muslin, ironed onto freezer paper and printed my templates off the computer. Much easier - stiffer yes but that didn't matter for this particular project but I wouldn't like to make a throw or a bed quilt.