PETG and TPU are both useful, forgiving-enough materials right up until moisture starts sneaking in. Then PETG gets uglier, stringier, and less predictable, while TPU becomes more annoying to feed cleanly and more likely to show the kind of surface mess that wastes time on what should have been routine prints.
If you keep open spools around for more than a quick one-and-done job, a filament dryer usually pays for itself faster than most cosmetic printer upgrades. The trick is buying the right kind of dryer for your bench instead of grabbing the first box that claims it gets warm.
The short answer
The SUNLU Filament Dryer S4 is the best filament dryer for PETG and TPU for most busier benches because it gives you the most flexible multi-spool answer without forcing you into a weird ecosystem-specific purchase. If you want a smaller two-spool option, the Creality Space Pi Filament Dryer Plus is the stronger compact pick. If you care more about stronger drying performance than footprint, the PrintDry Pro 3 is the more serious buy.
Best filament dryers for PETG and TPU
Best filament dryer for busier PETG and TPU benches
SUNLU Filament Dryer S4 — The SUNLU S4 is the easiest recommendation when you regularly rotate multiple open spools and want one box that can handle more material without constant juggling.
- 4-spool capacity
- up to 70C max drying temperature
- 350W PTC heater
- triple circulation fan airflow
- supports 1.75mm, 2.85mm, and 3.0mm filament
Best compact filament dryer for everyday PETG and TPU use
Creality Space Pi Filament Dryer Plus — The Creality Space Pi Filament Dryer Plus makes more sense if you want a smaller two-spool footprint with direct print-while-drying convenience instead of jumping straight to a larger four-spool box.
- 2-spool capacity
- 360 degree heated-air circulation
- LCD control screen
- direct-print drying with dual filament ports and PTFE tubes
- supports PLA, PETG, ABS, TPU, PC, PP, ASA, and PETG-CF
Best stronger-moisture-control pick for harder cases
PrintDry Pro 3 Filament Dryer — The PrintDry Pro 3 fits buyers who care more about serious drying performance and recovery on problem spools than about getting the cheapest or smallest box.
Best two-spool alternative for people who want capacity without going huge
EIBOS Cyclopes Filament Dryer — The EIBOS Cyclopes is a reasonable middle lane for owners who want more room than a tiny single-spool dryer without committing to a bench-hogging setup.
Best ecosystem pick for Kobra 3 owners doing color work
Anycubic ACE Pro Filament Dryer Box — The Anycubic ACE Pro is the more specific answer when your PETG or TPU workflow already lives inside the Kobra 3 color-print ecosystem and you want drying plus managed feeding in one lane.
- multi-spool drying and feed system for Anycubic color-print workflow
- active drying while feeding supported materials
- automatic filament management oriented around Kobra 3 ecosystem use
- built for humidity-sensitive multi-color bench setups
- stronger fit for owners wanting fewer spool swaps and less handling
Why PETG and TPU owners benefit from dryers sooner than PLA-only users
- PETG shows moisture fast: stringing, rougher top surfaces, and less predictable finish are common when spools have been sitting out too long.
- TPU rewards better storage and drying: flexible material already asks more from the feed path, so adding moisture on top makes the whole workflow sloppier.
- Open-spool habits compound the problem: if you bounce between colors, leave partial rolls on the bench, or print in bursts, wet-spool issues creep in without much warning.
- Drying is often cheaper than troubleshooting: many bad prints get blamed on slicer settings or machine tuning when the spool itself is the bigger issue.
Which one should you buy?
Buy the SUNLU S4 if you run multiple open spools and want the most flexible all-around answer
This is the strongest fit for makers, small shops, and anybody who keeps PETG and TPU in rotation instead of treating them like occasional specialty materials. More capacity matters when the real problem is moisture across several active spools, not just one emergency rescue job.
Buy the Creality Space Pi Plus if you want the cleaner compact answer
This makes more sense when bench space matters and two-spool convenience is enough. It is easier to justify for everyday owners who want active drying and print-while-drying convenience without moving up to a larger four-spool box.
Buy the PrintDry Pro 3 if your moisture problems are recurring and expensive
This is the better fit when you are less concerned with footprint and more concerned with actually recovering touchier spools or keeping higher-risk materials under better control over time.
Buy the EIBOS Cyclopes if you want a middle-ground two-spool option
This is for buyers who like the idea of more capacity than a basic compact unit but do not want a larger multi-spool box living on the bench full time.
Buy the Anycubic ACE Pro if your Kobra 3 color workflow is the real priority
This is the more specific answer, not the universal one. It makes more sense when your bench already revolves around the Anycubic color ecosystem and you want drying plus feed management together.
What matters most in a dryer for PETG and TPU
- Enough capacity for your real habits: if you keep multiple PETG colors or flexible spools open, one-spool solutions get old fast.
- Print-while-drying support: useful when you want to keep moisture from creeping back in during longer jobs.
- Bench footprint: the best dryer on paper is still annoying if it does not fit your actual workspace.
- Material mix: if PETG and TPU are only the start and nylon or ASA are coming later, it is smarter to buy a dryer with a little more headroom now.
When a dryer is worth it
Buy one if PETG or TPU is already part of normal use, if your spools sit out between projects, or if you are tired of wasting time deciding whether a bad print came from tuning or from a damp spool. In those cases, a dryer is less of an accessory and more of a workflow stabilizer.
When you can wait
If you mostly print PLA, open new spools only when needed, and rarely leave moisture-sensitive material exposed for long, a dryer can wait. But for repeat PETG and TPU use, it usually moves from optional to sensible pretty quickly.
Bottom line
If you want the best filament dryer for PETG and TPU for most real benches, buy the SUNLU Filament Dryer S4. If you want a smaller everyday option, buy the Creality Space Pi Filament Dryer Plus. If your bigger problem is stronger drying performance on wetter spools, move up to the PrintDry Pro 3.