Humidity Meter Upgrade for Sunlu S4 Filament Dryer.
Use the original two screws to fix it. No parts are needed, just print it.
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I recommend using ABS or PETG for printing because PLA has a lower heat resistance.
However, if you're only drying PLA, it's not an issue.
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Printable without supports.
Please let me know if you have any issues.