Fan duct for LOGresse (Prusa Steel) carriage and radial fan

This new fan duct for a radial fan and single extruder aims to blow efficiently around the deposited material, while keeping view and acces to the front part of the nozzle.
The efficiency is partly due to several thin walls that guide and distribute the air flow along the fan duct. You can see their shapes on the last picture (cut view from CAD model)
It has been designed to be mounted on the x-carriage of the LOGresse (https://www.logre.eu/wiki/Logresse/en)
There have been several versions.