Geeetech i3 Pro B Cooling Fan Duct, 40mm holes (50mm fan)

thingiverse

Note that the spaces between the holes are precisely 40mm apart, while the fan's edge length would be a standard 50mm, leading many to mistakenly assume they're sold as such. Ensure these measurements are accurate before purchasing a fan. Rotate the piece 135 degrees until it lies flat, with the pipe pointing directly upwards. When slicing, especially using slic3r, carefully review each layer of the conical section to guarantee that all layers print with an equal number of lines and avoid unnecessary gap filling islands.