Unofficially, this is the world's largest cube puzzle. I get a headache just thinking about how one would go about solving this functioning 17x17x17 behemoth. If I actually tried solving this thing, I'd probably have a nervous breakdown.
Comprised of 1539 pieces and roughly 5.5-inches-long in each direction, creator Oskar van Deventer fabricated each individual part using a 3D printer, then he dyed and sorted each piece before assembling it into what your see here. The dyeing and sorting took 10 hours, while the assembling took another five. Hello, tedium!