Kleenex Tissue Box Holder

Inspired by http://www.funshop.co.kr/goods/detail/17164

When I first saw this item, I strongly desire to have it. But the price was 8 bucks, and I think it's too expensive for a piece of plastic.
Fortunately, I have a 3D printer. I decided to make my own.

This thing will work with any tissue box with 11cm~12cm height. Four pyramids inside the clip will hold the box tightly. It will never slip away.