Inspired by https://www.prusaprinters.org/prints/34475-prusa-mini-rhd-fan-duct-rev-c
Olof design was inspiring but the design itself has some internal flow restrictions (look like topology import errors) and was mounted way to high so I based my version on: https://www.thingiverse.com/thing:3249344
The air exit ports are smaller and the mounting is where it should be - right below the nozzle, not blowing directly onto heatblock.
Fits stock MINDA holder
Print it as is, ASA/PETG recommended.
The author hasn't provided the model origin yet.