SUNLU S4 vs Creality Space Pi: which filament dryer is the smarter buy?

Display

Neither product is really about a flashy screen, but the user interface still matters because a filament dryer should be easy to set and forget. The SUNLU S4’s key advantage is its newer, more premium feature set, including auto humidity control and temperature balance, which suggests a more advanced control experience overall. The Creality Space Pi keeps things simpler with one-key setting, which is great for quick use and less faff. Winner: SUNLU S4, because it appears to offer the more advanced control and automation package, even though both are designed to be straightforward.

Performance

This is the big one: drying performance. The SUNLU S4 is built as a 4-spool dryer, so its main performance edge is capacity and workflow efficiency. If you run multiple printers, print in batches, or keep several hygroscopic filaments on the go, drying four spools at once is a serious productivity boost. The auto humidity control and fast heating also point to a more hands-off, more consistent drying experience. The Creality Space Pi is aimed at the more common single-spool or smaller-scale use case, but it still covers a broad range of materials including PLA, PETG, ABS, TPU and nylon, which is impressive at this price. Winner: SUNLU S4 for raw capability and multi-spool throughput; Creality wins only if you measure performance per pound spent.

Build quality and design

SUNLU has positioned the S4 as a premium “official” dryer box with upgraded temperature balance, which suggests attention to even heating and a more robust enclosure. That matters because hot spots and uneven drying are exactly what you do not want when trying to rescue damp filament. Creality’s Space Pi also has a strong reputation and a built-in fan, which should help circulate air and improve consistency, but it is clearly the more compact, value-focused design. If you want a dryer that feels like a workshop appliance rather than an accessory, the SUNLU has the edge. Winner: SUNLU S4.

Battery life

Neither product has a battery, so this category does not apply in the usual sense. For filament dryers, the practical equivalent is how efficiently they maintain temperature and humidity without constant babysitting. The SUNLU S4’s auto humidity control gives it the advantage for long drying sessions because it is designed to manage conditions more intelligently. Creality’s one-key approach is simpler, but less adaptive. Winner: SUNLU S4 on long-session convenience.

Price and value for money

Here the Creality Space Pi absolutely swings hard. At £63.00, it is £36.99 cheaper than the SUNLU S4 at £99.99, which is a meaningful gap for a tool that many makers will use occasionally rather than constantly. It also has the stronger review count at 2,508 reviews versus SUNLU’s 1,070, which gives it a very solid trust signal for a lower-cost buy. The SUNLU is easier to justify only if you genuinely need the 4-spool capacity, advanced automation, and a more premium setup. Winner: Creality Space Pi, by a clear margin.

Game library/features

This category maps best to features and filament compatibility. The SUNLU S4’s standout feature is its 4-spool capacity plus auto humidity control, fast heating, and temperature balance. That makes it the more feature-rich machine overall, especially for serious multi-material users. The Creality Space Pi still has a strong feature set for the money, including built-in fan, filament storage holder, one-key setting, and support for 1.75/2.85mm spools across PLA, PETG, ABS, TPU and nylon. Winner: SUNLU S4 for the richer feature set; Creality wins on simplicity and sensible essentials.

Overall user experience

This is where the real decision lands. The SUNLU S4 feels like the better choice for makers who hate compromises: more capacity, more automation, and a more premium drying workflow. It is the one you buy if you regularly dry multiple spools, print a lot of engineering materials, or want a dryer that can sit at the centre of a busy print farm or enthusiast bench. The Creality Space Pi is the smarter everyday purchase for most hobbyists because it is much cheaper, highly rated, and still covers the main filament types people actually use. It is the kind of product that solves the problem without demanding a big budget. Winner: Creality Space Pi for most users, SUNLU S4 for power users.

Overall summary: the SUNLU S4 is the better machine on paper, especially for capacity and automation, but the Creality Space Pi is the better buy for most people because it delivers the core filament-drying job at a much lower price. If you need to dry four spools at once, buy the SUNLU. If you want the best value and a proven, no-nonsense dryer, buy the Creality.