I have used White PLA filament for the Box and Yellow PLA filament for the Lid. With 0.4 mm Nozzle. at 0.2mm layer height. I have changed the Shell settings to minimize the gram-age, you can find that in the attached image. Wall thickness= 0.4 mm Wall line Count= 1 Top/bottom thinkness= 0.8 Top thickness= 0.4 top layer= 2 Bottom thickness= 0.4 bottom layer= 2 The image is a blurry don't know why so I have updated the info here. Infill Pattern= Cubic(you can choose what ever you want as after as it give strength to the part it is ok) Infill density= 30% mine ( again its up to you 80 will yield a higher strength result but I have been using that power bank for quiet some time and don't feel that it is sometime fragile)