Charging woes on the Galaxy Watch 9 and Galaxy Watch Ultra 2 are well-documented at this point, and users have long complained that the new smartwatches aggressively throttle charging speeds due to heat buildup. Users are tired of waiting for Samsung to fix the issue, and several have taken matters into their own hands with makeshift solutions to get fast charging times.
Reddit user aloowak designed and 3D printed an air-cooled charging cradle for the Galaxy Watch 9. A 60mm Noctua NF-A6x25 fan (used in PC cases) underneath the charger turns on when the watch is placed on the charging puck, thanks to a micro-switch that gets pressed. The user claims that at 23° ambient temperature, using the fan allowed their charging time from 15% to 100% to be cut down from 2 hours 10 minutes to just 1 hour 15 minutes, almost half!
