Anet A8, Omni m505, Crossflow duct

Crossflow duct with as large inner diameter as possible for minimal restriction of airflow
still thin enough to fit under nozzle heater.
I guess that the tolerances is quite loose when we assemble uor extruders, so if the nozzle hitting the duct, warm the wide middle part with a heatgun, when it is still soft twist it a bit so it goes free ffrom the nozzle heatblock.