SUNLU S1 or Comgrow SH01: which filament dryer box is the smarter buy?

Price and value for money

Product A, the SUNLU 3D Filament Dryer Box S1, costs £29.99. Product B, the Comgrow SH01, costs £42.74. That is a clear £12.75 saving in favour of SUNLU, which is a meaningful gap for a box whose main purpose is storage and drying rather than active printing performance. Winner: SUNLU S1. It delivers the same broad use case for notably less money, and that matters a lot when you may want to buy more than one dryer box or spend the savings on better filament.

Compatibility and flexibility

SUNLU lists support for 1.75mm, 2.85mm and 3.00mm filament, while Comgrow lists 1.75mm/2.85mm PLA, PETG and ABS material compatibility. On paper, SUNLU is the more flexible option because it explicitly covers 3.00mm filament as well as the more common 1.75mm and 2.85mm sizes. For makers with mixed spools, older machines, or a workshop that handles different filament diameters, that extra compatibility is genuinely useful. Winner: SUNLU S1. It offers broader stated support and is the safer pick if your filament drawer is a bit of a mixed bag.

Build quality and design

Neither product listing gives hard engineering specs here, so we have to judge from positioning and market reputation. Both are purpose-built filament dryer/storage boxes with spool-holder functionality, and both are designed to keep filament dry during printing rather than acting like premium heated dehydrators. SUNLU has the stronger brand recognition in filament accessories, and its 4.5/5 rating from 2,992 reviews suggests a very solid track record. Comgrow is also well-reviewed at 4.4/5 from 3,225 reviews, which is excellent, but the slightly lower score suggests a touch less polish or consistency. Winner: SUNLU S1, by a narrow margin. The rating edge is small, but it points to slightly better user satisfaction overall.

Performance

Because these are filament dryer boxes rather than full-blown industrial dryers, the key performance question is whether they keep filament protected and feeding smoothly during a print. Both products are marketed around the same core benefit: keeping filaments dry during 3D printing and acting as a spool holder. With no explicit performance numbers provided, the best evidence comes from user ratings and review volume. SUNLU’s 4.5/5 across 2,992 reviews is excellent and suggests dependable real-world performance. Comgrow’s 4.4/5 across 3,225 reviews is also strong, but it does not beat SUNLU on satisfaction. Winner: SUNLU S1. It appears to be the more consistently well-liked option in the field.

Display/screen quality

No display or screen specifications are provided for either product, so there is no meaningful technical advantage to compare here. In practical buyer terms, this category is a tie. If you were hoping for a more advanced interface, neither listing gives evidence of that. Winner: tie.

Game library/features

These products are not gaming devices, so there is no game library to compare. Translating this into the real features that matter for filament drying, both are focused on the same core function: storage, drying, and spool holding. Comgrow explicitly mentions PLA, PETG and ABS, while SUNLU emphasises filament diameter compatibility and storage box use. SUNLU still edges the feature win because its broader diameter support is more useful in a workshop setting. Winner: SUNLU S1.

Battery life

There is no battery in either product based on the information provided, so this category does not apply. If you were thinking about portability or cordless use, neither box is positioned that way. Winner: tie.

Overall user experience

This is where the decision becomes pretty clear. SUNLU is cheaper, more broadly compatible on paper, and slightly better rated by a large number of users. Comgrow is still a credible option with a strong review count, but it costs significantly more without any listed advantage that clearly justifies the extra £12.75. For most hobbyists, that extra spend would be better put into quality filament, spare nozzles, or a second spool. Winner: SUNLU S1. It offers the cleaner value proposition and the more convincing all-round package.

Overall summary: If you want the best buy, the SUNLU S1 is the one to choose. It is cheaper, has the stronger rating, and offers wider stated filament-size compatibility. The Comgrow SH01 is not a bad product, but in a head-to-head comparison it struggles to justify the higher price when the SUNLU does the same job for less. If you are buying one dryer box today, SUNLU is the smarter pick.