Printed with 0,2mm layer hight, outer parimeter 3, top and bottom 3 layers. Halfway the print I paused the print and changed color manualy when done printing , run a 4mm drillbit thrugh the hole turning the drill the wrong way around , all the way through. Before running the drillthe right way. after cleaning up the caster, i sanded the wheel with fine grid sandpaper, to get a smooth surface, and to get a perfect fit.