A 3D filament dry box is a box with heaters that can dry filament and evaporate moisture. It is usually with a temp sensor and a moisture sensor in it. You can achieve better 3D printing results by drying the filament in a filament dryer before printing. The 3D filament feeds through the hole in the dry box directly into the printer nozzle. SUNLU makes the most popular 3D filament dry box on the market. SUNLU offers the S1, S1 Plus, S2 filament dryers and the most powerful filament dryer - SUNLU S4 . The SUNLU S4 is the most powerful filament dryer available.
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![[20% OFF] SUNLU Filament Dryer S4, Temperature Balance and High Efficiency, Dryer and PLA Meta Filament Bundle](//uk.store.sunlu.com/cdn/shop/files/S4_SUNLU13thanniversary.jpg?v=1782804290&width=300)
![[20% OFF] SUNLU Filament Dryer S4, Temperature Balance and High Efficiency, Dryer and PLA Meta Filament Bundle](//uk.store.sunlu.com/cdn/shop/files/S4Footchange.jpg?v=1773632687&width=300)
[20% OFF] SUNLU Filament Dryer S4, Temperature Balance and High Efficiency, Dryer and PLA Meta Filament Bundle
Regular price From £91.99 GBPRegular price£159.99 GBP-43% Sale price From £91.99 GBP -
Save 9%
![[20% OFF] SUNLU AMS Heater, Upgraded your Bambu AMS, Enables Drying while Printing](//uk.store.sunlu.com/cdn/shop/files/AMS_SUNLU13thanniversary.jpg?v=1782804278&width=300)
![[20% OFF] SUNLU AMS Heater, Upgraded your Bambu AMS, Enables Drying while Printing](//uk.store.sunlu.com/cdn/shop/files/SUNLUAMSHeater_UpgradedyourBambuAMS_EnablesDryingwhilePrinting_SaveanAMS2ProforYou_1.png?v=1773212246&width=300)
[20% OFF] SUNLU AMS Heater, Upgraded your Bambu AMS, Enables Drying while Printing
Regular price From £99.99 GBPRegular price£109.99 GBP-9% Sale price From £99.99 GBP -
Save 48%
![[20% OFF] SUNLU FilaDryer SP2, 2-in-1 Filament Dryer Combine with Storage Box, Up to 70℃(158°F) Drying and Seamless Storage, Compatible with spool size 1kg×2 or 2kg×1 or 3kg×1](//uk.store.sunlu.com/cdn/shop/files/SP2_SUNLU13thanniversary.jpg?v=1782804283&width=300)
![[20% OFF] SUNLU FilaDryer SP2, 2-in-1 Filament Dryer Combine with Storage Box, Up to 70℃(158°F) Drying and Seamless Storage, Compatible with spool size 1kg×2 or 2kg×1 or 3kg×1](//uk.store.sunlu.com/cdn/shop/files/8_1_1_1d6e8130-3afa-4b4a-8339-29cb13f7de5d.jpg?v=1775642624&width=300)
[20% OFF] SUNLU FilaDryer SP2, 2-in-1 Filament Dryer Combine with Storage Box, Up to 70℃(158°F) Drying and Seamless Storage, Compatible with spool size 1kg×2 or 2kg×1 or 3kg×1
Regular price From £43.99 GBPRegular price£84.99 GBP-48% Sale price From £43.99 GBP -
Save 52%
![[20% OFF] SUNLU Filament Dryer S2, 360° Surround Heating During 3D Printing, Dryer and PLA+ Filament Bundle, Get PLA+ at £8/KG](//uk.store.sunlu.com/cdn/shop/files/S2_SUNLU13thanniversary.jpg?v=1782804297&width=300)
![[20% OFF] SUNLU Filament Dryer S2, 360° Surround Heating During 3D Printing, Dryer and PLA+ Filament Bundle, Get PLA+ at £8/KG](//uk.store.sunlu.com/cdn/shop/files/SUNLU_S2_FILADRYER_2026_LATEST_VERSION_ENGLISH_MOBILE_1.jpg?v=1779765858&width=300)
[20% OFF] SUNLU Filament Dryer S2, 360° Surround Heating During 3D Printing, Dryer and PLA+ Filament Bundle, Get PLA+ at £8/KG
Regular price From £38.24 GBPRegular price£79.99 GBP-52% Sale price From £38.24 GBP -
Save 48%
![[20% OFF] SUNLU S1 Plus Filament Dryer, Keeping Filament Dry During 3D Printing](//uk.store.sunlu.com/cdn/shop/files/S1PLUS_SUNLU13thanniversary.jpg?v=1782804295&width=300)
![[20% OFF] SUNLU S1 Plus Filament Dryer, Keeping Filament Dry During 3D Printing](//uk.store.sunlu.com/cdn/shop/files/sunlu_filadryer_s1plus_filament_dryer_efc57425-4e40-48d7-9252-42c942cfda34.jpg?v=1777519738&width=300)
[20% OFF] SUNLU S1 Plus Filament Dryer, Keeping Filament Dry During 3D Printing
Regular price From £30.99 GBPRegular price£59.99 GBP-48% Sale price From £30.99 GBP -
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SUNLU AMS Lite Heater, AMS Lite Enclosure, Dual-airflow ensures perfect prints.Up to 70°C, supports PLA/PETG/ABS/ASA/PA
Regular price £119.99 GBPRegular price£109.99 GBPSale price £119.99 GBP
![[20% OFF] SUNLU Filament Dryer S4, Temperature Balance and High Efficiency, Dryer and PLA Meta Filament Bundle](http://uk.store.sunlu.com/cdn/shop/files/S4_SUNLU13thanniversary.jpg?v=1782804290&width=300)
![[20% OFF] SUNLU Filament Dryer S4, Temperature Balance and High Efficiency, Dryer and PLA Meta Filament Bundle](http://uk.store.sunlu.com/cdn/shop/files/S4Footchange.jpg?v=1773632687&width=300)
![[20% OFF] SUNLU AMS Heater, Upgraded your Bambu AMS, Enables Drying while Printing](http://uk.store.sunlu.com/cdn/shop/files/AMS_SUNLU13thanniversary.jpg?v=1782804278&width=300)
![[20% OFF] SUNLU AMS Heater, Upgraded your Bambu AMS, Enables Drying while Printing](http://uk.store.sunlu.com/cdn/shop/files/SUNLUAMSHeater_UpgradedyourBambuAMS_EnablesDryingwhilePrinting_SaveanAMS2ProforYou_1.png?v=1773212246&width=300)
![[20% OFF] SUNLU FilaDryer SP2, 2-in-1 Filament Dryer Combine with Storage Box, Up to 70℃(158°F) Drying and Seamless Storage, Compatible with spool size 1kg×2 or 2kg×1 or 3kg×1](http://uk.store.sunlu.com/cdn/shop/files/SP2_SUNLU13thanniversary.jpg?v=1782804283&width=300)
![[20% OFF] SUNLU FilaDryer SP2, 2-in-1 Filament Dryer Combine with Storage Box, Up to 70℃(158°F) Drying and Seamless Storage, Compatible with spool size 1kg×2 or 2kg×1 or 3kg×1](http://uk.store.sunlu.com/cdn/shop/files/8_1_1_1d6e8130-3afa-4b4a-8339-29cb13f7de5d.jpg?v=1775642624&width=300)
![[20% OFF] SUNLU Filament Dryer S2, 360° Surround Heating During 3D Printing, Dryer and PLA+ Filament Bundle, Get PLA+ at £8/KG](http://uk.store.sunlu.com/cdn/shop/files/S2_SUNLU13thanniversary.jpg?v=1782804297&width=300)
![[20% OFF] SUNLU Filament Dryer S2, 360° Surround Heating During 3D Printing, Dryer and PLA+ Filament Bundle, Get PLA+ at £8/KG](http://uk.store.sunlu.com/cdn/shop/files/SUNLU_S2_FILADRYER_2026_LATEST_VERSION_ENGLISH_MOBILE_1.jpg?v=1779765858&width=300)
![[20% OFF] SUNLU S1 Plus Filament Dryer, Keeping Filament Dry During 3D Printing](http://uk.store.sunlu.com/cdn/shop/files/S1PLUS_SUNLU13thanniversary.jpg?v=1782804295&width=300)
![[20% OFF] SUNLU S1 Plus Filament Dryer, Keeping Filament Dry During 3D Printing](http://uk.store.sunlu.com/cdn/shop/files/sunlu_filadryer_s1plus_filament_dryer_efc57425-4e40-48d7-9252-42c942cfda34.jpg?v=1777519738&width=300)
