Simple lamp shade of size 170mm height, 170mm diameter. Holding base with 45mm diameter ring for E27 bulb sockets. Outside shell is just 1 perimeter to shine through, so it's not "robust" but "stable enough". Printed with 0.2mm layers (gives nice texture), 0.38mm line width (Cura) and 45mm speed in white PLA. Prints 10h, needs 55g of material.