For this modern lampshade, I used a nice lamp attachment from IKEA:
"SEKOND" (http://www.ikea.com/at/de/catalog/products/50279373/) which fits nicely.
Please note that you have to use a LED lamp, since they're much safer for this use and don't produce as much heat as a normal lightbulb, so the lampshade is safe to use. (especially if you use PLA)
You will need 21 rips and the ring printed, NO tools or screws! :)