Wanhao D9 - custom cooler

For my MK1 I had replaced the normal cooling fan with a ballbearing radialfan blowing fresh air from the side. I had very good results with it. It looked a bit ugly and with printing the contruction would always bend a little because of the heat, but it worked. After my MK2 upgrade I installed the fan that comes with it. Also a radial fan but not that good.
That thing would only give a light breeze. Not enough for proper cooling of PLA with small detail or overhanging structures. Because of the