After weeks of testing the GratKit Firefly V2.0, I can confidently say this filament dryer has transformed my 3D printing workflow. The Tuya app integration is seamless – I love adjusting temperatures remotely while sipping coffee in another room. Watching real-time humidity drop from 40% to 10% during a PETG drying cycle feels like witnessing magic.

The dual heating system with top/bottom sensors delivers impressively even heat distribution. My previously brittle PLA+ filament became buttery smooth after just 4 hours at 50°C. The silent 5015 fan is a dream compared to my old dryer's helicopter-like noise – now I can dry filaments overnight without disturbing my housemates.

However, the plastic casing does feel slightly cheap for the price point. During an ABS drying test at 70°C, I noticed minor warping on the bottom panel (though no melting occurred). The included bearing-less spool holders create noticeable friction during direct printing – I ended up upgrading to aftermarket bearings for smoother operation.

Where this dryer truly shines is its smart features. Through Home Assistant integration, I've automated my entire workflow: lights change color when reaching target temperature, and my printer pauses until filaments are perfectly dried. The rear filament exit is genius for compact setups, though the rubber grommet could be upgraded to a PTFE tube connector.

While not perfect (I wish it had scheduled start times), the Firefly V2.0 outperforms competitors at this price range. For makers battling humid environments or finicky filaments, this dryer delivers professional results with smart-home convenience.