A maker revisits their DIY 3D printing filament dryer project with a V2 version featuring a custom PCB, SHT30 temperature/humidity sensor, 100K NTC sensor, and a 12V polyimide resistive heater inside a 5L food storage container. Full documentation and a GitHub project are available. One noted limitation is that saturated warm air has no exit path, a common issue even with commercial dryers like Sunlu, which is typically addressed by leaving the lid slightly open.
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