Filaments can absorb moisture from the air and this may have negative effect to 3D printing. Some filament types are very sensitive to this effect (PETG, Nylon for example). Filament dryers can dry the filament or keep the filament dry during the printing process.
In this two video eSun eBox and Sunlu Filadryer S1 are tested. On this channel, you can already find detailed review of each product. In this episode you can see hardware comparison and two tests, to find the answer to question: Which one dries better?
In test I used two HDC1080 temperature and humidity sensors (with two Arduinos).

You can check the price on Banggood (affiliate links):
eSun eBox:
https://www.banggood.com/ESUN-Filamen...

Sunlu Filadryer S1:
https://www.banggood.com/SUNLU-FilaDr...

Used Temperature and humidity sensor HDC1080:
https://www.banggood.com/GY-213V-HDC1...

Review videos:
eSun eBox:    • Testing eSUN eBox filament dryer - un...  
Sunlu Filadryer S1:    • Testing SUNLU FilaDryer S1 - filament...  

Used HDC1080 sensor demo code (only modification was the delay to 30 seconds, instead of 3 sec.)
http://arduinolearning.com/code/ardui...

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Contents:
0:00 About filament dryers
1:14 Hardware comparison
7:08 Test 1: drying nylon
9:30 Preparing HDC1080 sensor
10:18 Test 1: drying a sponge
18:07 Conclusions

#esun #sunlu #filamentdryer #3dprinting