Lamp shade to fit a regular E27 bulb receptacle. The included STL file fits a 3-1/2in or 88mm diameter receptacle base. Print the Shade.stl in Spiral Vase mode with a 0.5mm extrusion width and no solid bottom. The shade snaps into the base. Apply super glue to fix it permanently. The base goes between the wall/ceiling surface and the receptacle can fit into the slot at the bottom of the base. Use Customizer to change dimensions. An OpenSCAD file is included for your customization.