My Fiance has small hands and cannot hold some of these bottles! she asked me to come up with a solution so here it is! the circle Diameter is 88mm or 3.46 in. It will fit any bottle that gradually gets bigger than that! Prints faster on .28 with less wall loops but I do 10 wall loops just to make sure its strong its probably overkill. I like to do .16mm lines for a better feel but either is good!