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