For the smoothest finish, 3D foam requires a careful balance between the best stitch angle for tight stitching and the management of inner-edge densities. The best way to get tight, even stitches is for stitch angles to be perpendicular to the edges of a stroke at any given point. Due to the incredibly high density of the stitching, one must be careful to gently transition into curves and corners since density is always higher on the inside edge of any curve or corner. If stitch angles aren’t carefully balanced, you can have ridiculously dense corners and inner curves that create lumpy, textured surfaces at best and thread breakage at the worst. This technique takes care because when angles are too oblique, stitches can appear loose, harming the overall finish.
—ErichCampbell.com
