Summary

Update:
Added V 1.5 based on feedback and testing. V 1.0 is pretty close to my nozzle so will likely melt and/or burst into flames at some point. YMMV.

As much as I love the Half Stepper, I wasn't real keen on the nozzle. It seemed to blow straight down rather than angled toward the nozzle so as to cool the filament as soon as it is placed.

There are many other annular airflow coolers out there, but I had very limited success remixing them for the FFCP and most would require that I refit or remove the Half Stepper.

So here it is in all its rough-hewn glory.

The original is available on TinkerCad (search Half Stepper circular nozzle).