This a 3D fractal Cube, 243 by 243 by 243 mm in size. I have personally never printed it but it should look pretty awesome (for example in Black with some RGB LEDs in it)
Read how I made for further Information or contact me via Twitter: @oliiversiimon.

Btw the Fractal-Cube-6 might take up tp 4 Kg of PLA and 50 days to Print (Fractal-Cube-5 was 0.2 Kg and ~ 2.5 days)