Square Pin stand

This Pen stand design can be printed in vase mode with no problem. But I need this to be strong, as it will be holding lot of pens and should survive rough handling on my work table. So I printed it with  2 outer walls, 4 bottom layer, 0% infill and 0 top layer with layer height of 0.25mm, I am using 0.5mm nozzle on my printer. I have used black PAL for this (Nozzle temperature = 200*C and with no heated bed).