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Hi! If you plan to embroider it, you should add a "running stitch by 10 steps" :) "Set Pen size to 3" works on screen, but does not affect the ebroidery, because the thread has always the same thickness. If you want it a little bit wider, you can use a satin stitch by minimal 8: "stain stitch with width 8". This should work. Best, from the TurtleSTitch team