Wanhao Duplicator 4S part cooling fan duct (and other clones)

thingiverse

This is a remix of fwiffo's Active FAN BackCooling, and I'm grateful to fwiffo for designing the BackCooler. It cools the filament from both sides efficiently while giving a clear view of the nozzle. Unfortunately, the original model has several issues in my opinion. The first one concerns the mounting system. The fans and duct are only secured with friction, which causes them to shake off over time. The second problem lies with the duct's wall thickness. In some areas, it's too thin, resulting in holes. I addressed both of these problems. The clip became more rigid, securing the duct with 4 M2 screws (about 16 mm long) and 4 M2 nuts. I also reinforced the duct's walls to prevent further damage.