The DIY smart drying box I built using the SONOFF TH Elite has been running stably for over a week now, and I’m quite satisfied with its performance. So this weekend, I organized all the files and uploaded the project to MakerWorld (Smart Filament Dryer with In-Print Heating Support).
Included in the model:(All parts are support-free and do not require AMS multi-color printing, except the drying box top cover. It is recommended to print with PETG or ABS due to high internal temperatures during heating. PLA may soften and deform.)
- Drying box base ×1
- PTC mounting bracket ×1
- Turbo fan top cover ×1
- Drying box ×1
- Drying box top cover ×1
- Sensor holder ×1
- Sensor wire clip ×1
- Sensor wire screw (left and right halves) ×1
- Sensor wire nut ×1
- Filament tray bracket ×2
- Filament tray rotating shaft ×2
Apart from these self-printed parts, only a few additional components need to be purchased. I’ve listed them below along with reference links. You can refer to the assembly guide on MakerWorld for detailed installation instructions.
| item Name | Quantity | Reference Link | Reference Price |
| TH Elite 16A with THS01 Sensor | 1 | Smart Temperature and Humidity Monitoring Switch | TH Elite – SONOFF Official | ¥120 RMB (＄20 USD） |
| 220V/110V 150W PTC | 1 | https://item.taobao.com/item.htm?id=42596000020 | ¥12.5 RMB (＄2 USD) |
| 7530 turbine blower fan (110V/220V AC) | 1 | https://item.taobao.com/item.htm?id=837324113053 | ¥20 RMB (＄2.5 USD) |
| 5.8L sealed container | 1 | https://item.taobao.com/item.htm?id=669727403098&skuId=5658467580964 | ¥17 RMB (＄2.2 USD) |
Features of this DIY filament dryer box:
💰 Lower cost – Total DIY cost is around 150 RMB (About ＄25 USD), with heating performance comparable to the Bambu AMS HT
💡 Easy to assemble – Few parts required, no complex wiring or electronics knowledge needed — just plug and go
🌀 Supports drying while printing – Unlike the AMS HT which stops heating during printing, this design keeps drying
🔒 High sealing design – Ideal for long-term storage when combined with desiccant
📈 Real-time temperature & humidity monitoring – View and adjust from the app; also supports historical data logging
📱 Smart integration – Supports alerts for threshold breach, connects to platforms like Home Assistant for automation
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