This duct is not the easiest print... before changing the duct to this!
This really helps with the airflow.
The tiny wine glass is a spiralize at 0.1mm in silver Silk PLA. It took a separate hand-aimed blower to get anything like this before changing the duct, but this is printed at about 20mm/s with nothing but the ducted blower of the ANYCUBIC. The stem here is hollow!
MakerGeeks High-Temp PLA
First tried printing the duct at 0.25mm, and it was a mess. Printed OK at 0.1mm, but had to slow down the printer to 50% or slower for the angled top section and still had some stuff to clean up. Installed that duct, then printed again; this time, it went perfectly at 100% speed.
This is a part exposed to some heat from the hot end it wraps around and radiated from the bed, so we went with the "dishwasher safe" high-temp PLA. We'll see how that holds up. I'm printing spares in anticipation of it not lasting forever, but I don't see any softening or other defects developing after an hour or so of printing.