After building the original hypercube, I found the evolution. The parts seemed a lot better, and with the use of steel rods for the X-axis and thicker steel rods for the Y-axis I had to upgrade. But to my suprise the fan duct wasn't all that good. It blows air right on the hotend and it touches the heater.
So I started work on a new fan duct.
I soon figured out that I had to redesign the extruder mount to be able to fit my parts. I use a 40x40 fan for the E3D V6 and a 50 blower fan for layers.
I'm still testing, but so far it looks really good.