Free 

Used Cr_10 semi-circle as template. Raised the Fan connecting end. Made circle larger and moved it back towards base. Centered the nozzle.
Tested and adjusted airflow.
For those who want a full circle, the one I have not stopped using since its final version is https://www.thingiverse.com/thing:2912394
For those who have tipped me a coffee, I offer back a huge thanks. For those who wish to, I drink the cheap stuff.












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