此作品虽然是空心结构，不过并非采用冈本先生的Void Cube结构，其实跟Jing’s Pyraminx 一样，也是有弹簧和螺丝的.
It's so nice and I like it very much !!!
Translate into English:
This is my(DDR's) new puzzle, named "Holey Tetrahedron".
It is the first time that I try 3D printing, I am very satisfied with it.
I made this one hollow, but did not use the mechanism of Okamoto's.
It is something like Jing's Pyraminx.
Here are the photos and video.
Wish you like it.