Best Filament Dryer for 2026: What to Buy, How to Use It, and How to Store Filament
Buying the dryer is the easy part. Whether your filament is still dry next month depends on what happens after the timer beeps, so this guide covers the whole loop, tuned for San Diego humidity.
Updated September 2026. This guide replaces our earlier 2026 dryer roundups and corrects one of their specs: they listed the Creality Space Pi Plus at 80 °C, but Creality’s listing for the current V2 Plus gives 45–70 °C.
Average early-morning relative humidity at San Diego’s airport station, June through September (NOAA records, 1948–2015)
The relative humidity Bambu Lab says most filaments need to stay dry for an extended period
How soon freshly dried filament can start absorbing moisture and printing worse in a typical 55% RH room, per Bambu Lab
Top drying temperature of our best overall, best value, and best single-spool picks, $70 to $140 at today’s prices
The short version
- Best overall: SUNLU FilaDryer S4 Pro, $139.99. Four spools in two independently controlled chambers, up to 85 °C, and a humidity-hold mode with published thresholds.
- Best value: Sovol SH03, $109 on sale ($159 list). The same four-spool, two-chamber, 85 °C formula for less.
- Best single spool: Elegoo H1 HT, $70. 85 °C, a rotating spool, and vents that seal after drying. Brand new, so no long-term track record yet.
- Best for engineering filaments: SUNLU FilaDryer E2, $249.99 on sale. Reaches 110 °C and anneals finished parts.
- Best dry-and-store system: Polymaker PolyDryer. One heater dock, as many sealed boxes as you have spools.
- Best on a Bambu Lab printer: AMS 2 Pro ($359) for PLA and PETG, AMS HT ($149) for engineering filament. Neither dries unless it’s connected to the printer.
The habit that matters more than the model: dry, then either print straight from the dryer or seal the spool with fresh desiccant within the hour, and keep sealed storage under 20% RH, checked with a hygrometer.
Wet filament looks like a broken printer
There’s a repair call that shows up every summer. A printer that behaved all spring starts stringing. Walls come out rough and pitted, the nozzle crackles, and parts snap cleanly along a layer line. The owner reasonably decides something broke.
Often nothing did. Load a spool that’s known to be dry, print the same file, and the problems go away. Water in filament flashes to steam in the hotend, and Bambu Lab’s drying guide lists what follows: stringing, under-extrusion, holes, rough surfaces, and weaker parts. Our diagnostic guide gives moisture its own lane for exactly this reason: it’s cheap to test and easy to mistake for a hardware fault.
On the San Diego coast, wet filament is a question of when, not if. NOAA’s long-term records for the airport station average about 80% relative humidity in the early morning from June through September, and still the mid-60s in the afternoon. Bambu Lab says most filaments need air below 20% RH to stay dry for an extended period. A dryer resets a spool, and the room starts undoing that the moment the lid opens. That’s why this guide spends as much time on using and storing as on buying.
The best filament dryers for 2026
The big shift in the 2026 lineup: an 85 °C ceiling, two independently controlled chambers, and room for four spools are no longer premium features. SUNLU, Sovol, and Creality all sell that combination for $109 to $159, and Elegoo put 85 °C into a $70 single-spool box. The popular budget dryers of the last few years, like SUNLU’s S2 and Creality’s Space Pi, top out at 70 °C, below Bambu Lab’s recommended 75–85 °C for nylon, polycarbonate, and ABS.
How we picked: we compared each maker’s published specs and documentation, checked on September 21, 2026, against what the materials need. We haven’t bench-tested every unit here, so where a claim is only the manufacturer’s, we say so, and no links in this post are affiliate links. Spec score is a paper rating out of 5 for temperature range, capacity, zone control, storage features, and price per spool slot; it isn’t a lab test. The bar under each pick shows its top temperature on a 30–110 °C scale, with ticks at Bambu Lab’s top drying temperatures for common materials:
SUNLU FilaDryer S4 Pro
$139.99 at SUNLU
Price on SUNLU’s US store, September 21, 2026
Reaches Bambu Lab’s full range for PLA, PETG, TPU, nylon, PC, and ABS.
- Four 1 kg spools in two chambers, each with its own temperature and timer
- 45–85 °C, 380 W rated power
- Drying, annealing, and humidity-hold modes
Why it’s here: It’s the most complete answer to “dry it, then keep it dry” at this price. Run PETG at 65 °C on one side while PLA sits at 45 °C on the other. The humidity-hold mode is the storage feature that matters: per SUNLU, you set a trigger between 30% and 50% RH, the chamber re-dries when it gets there, and it stops at 25%.
The catch: Each chamber fits two standard 1 kg spools (220 × 210 × 211 mm per side), so big 3 kg spools won’t fit. The hold thresholds are SUNLU’s published numbers; we haven’t measured them. At 458 mm wide, it needs real bench space.
Sovol SH03
$109 on sale at Sovol ($159 list)
Sale price on Sovol’s US store, September 21, 2026
Reaches Bambu Lab’s full range for PLA, PETG, TPU, nylon, PC, and ABS.
- Four 1 kg spools up to 70 mm wide, or two up to 150 mm wide
- Two independent chambers with a 200 W PTC heater each; 45–85 °C, 400 W rated
- 10 filament presets, automatic dehumidification, live temperature and humidity readout
Why it’s here: The same four-spool, two-chamber, 85 °C formula as the S4 Pro for about $30 less at today’s sale price, and it takes spools up to 150 mm wide when you load two instead of four. Sovol rates it under 50 dB.
The catch: Sovol doesn’t publish when its automatic dehumidification kicks in or what humidity it holds, which makes it harder to plan storage around than SUNLU’s hold mode. And $109 is a sale price.
Elegoo H1 HT
$70 at Elegoo
Price on Elegoo’s US store, September 21, 2026
Reaches Bambu Lab’s full range for PLA, PETG, TPU, nylon, PC, and ABS.
- One spool, up to 85 °C
- Spool rotates during drying; two automatic vents open while drying and seal afterward
- Separate outlet for TPU and fiber-filled filament; 3.5-inch touchscreen with 11 presets
Why it’s here: Spool rotation and vents that seal themselves usually come on pricier units like Bambu’s $149 AMS HT. At $70, and not tied to any printer brand, it’s the easy recommendation for one printer, nylon and PC included.
The catch: It launched on July 24, 2026, so there’s no long-term reliability record yet, and every spec here comes from Elegoo’s launch announcement. One spool at a time.
SUNLU FilaDryer E2
$249.99 on sale at SUNLU ($349.99 list)
SUNLU’s US store showed it sold out when we checked on September 21, 2026
Clears Bambu Lab’s 85 °C nylon and PC ceiling and reaches the low end of PPA-CF’s 100–130 °C.
- 35–110 °C with a 500 W PTC heater
- Fits spools up to 250 × 153 mm: two 1–2 kg spools or one 3 kg spool, per SUNLU
- Annealing mode for finished parts; 0–99 hour timer
Why it’s here: It’s the only dryer here that clears 85 °C, which matters for filaments like PPA-CF and for annealing parts after printing. It also swallows 3 kg spools.
The catch: Its humidity sensor switches to a protection mode above 80 °C and shows under 10%, and SUNLU says it needs about 20 hours below 70 °C to recover its accuracy, so weigh your spools instead. The spool itself has to be rated for whatever temperature you set. Big, and overkill for PLA.
Polymaker PolyDryer
Storage boxes from $29.99 at Polymaker; about $65 for dock and box per All3DP
Polymaker price September 21, 2026; All3DP figure from its July 2026 roundup
Covers PLA, PETG, and the low end of TPU’s range; not nylon, PC, or ABS.
- A heater dock plus sealed storage boxes sold separately; you print straight from the box
- Three power levels instead of a set temperature; Polymaker puts the top level at 68–73 °C around the spool
- Color-changing desiccant and a hygrometer in every box; the Box XL fits 3 kg spools (dock adapter sold separately)
Why it’s here: It treats storage as the system and drying as a service to it: one dock, as many sealed boxes as you have spools. Polymaker also publishes what the boxes achieve. In its test, PLA, PETG, and PC left open for two weeks at 20 °C and 60% RH, then dried, settled at 10–20% RH on the highest power level.
The catch: About 70 °C at most, so it won’t recover nylon or PC, and there’s no temperature setpoint. Polymaker’s own review summary lists drying very wet filament among customer complaints.
Bambu Lab AMS 2 Pro and AMS HT
AMS 2 Pro $359 and AMS HT $149 at Bambu Lab
Prices on Bambu Lab’s US store, September 21, 2026
AMS 2 Pro: PLA and the low end of PETG. AMS HT: Bambu Lab’s full range.
- AMS 2 Pro: four spools, drying up to 65 °C with spool rotation and electromagnetic vents, automatic feeding
- AMS HT: one spool, up to 85 °C, bypass outlet for TPU and fiber-filled filament, 150 W average draw
- RFID reads Bambu spools and sets the drying profile for you
Why it’s here: Drying and sealed storage happen right where the filament feeds from, which removes the transfer step where most dried spools pick moisture back up.
The catch: Neither unit dries on its own. Each has to be connected to a Bambu printer, and X1 or P1 owners need Bambu’s power adapter for drying. Bambu says the AMS 2 Pro can’t fully dry ABS, ASA, nylon, PC, PVA, or its CF blends; that’s the HT’s job. On drying mid-print, Bambu’s store FAQ says a unit feeding the current print can’t dry, while its wiki now describes drying while printing with automatic caps (45 °C when PLA is loaded). Check your firmware’s release notes.
Also worth a look
- Creality SpacePi X4, $159 on sale ($199 list): four spools, two independent chambers, 85 °C, and active dehumidification, per Creality. All3DP reports a 200 W heater per chamber, and 3DPrinting.com says its desiccant compartment regenerates in the drying airflow. A close alternative to the S4 Pro and SH03.
- Creality Space Pi V2 Plus, $89 on sale and sold out when we checked: two spools at 45–70 °C. Plenty for PLA and PETG; our Space Pi settings guide covers the whole family.
Skip these if you print more than PLA
Dryers that top out at 50–55 °C, like SUNLU’s S1 Plus (35–55 °C per 3DPrinting.com) or Sovol’s SH01 (40–50 °C per All3DP), are fine for keeping PLA warm and dry while it prints. They can’t reach Bambu Lab’s recommended range for TPU, nylon, PC, or ABS, and a cheap dryer you outgrow in three months isn’t cheap.
Side by side
| Dryer | Price | Spools | Top temp | Separate zones | Between prints | Dries without a printer |
|---|---|---|---|---|---|---|
| SUNLU FilaDryer S4 Pro | $139.99 | 4 × 1 kg | 85 °C | Yes, 2 | Humidity hold: re-dries at your 30–50% set point, stops at 25% | Yes |
| Sovol SH03 | $109 sale ($159) | 4 × 1 kg, or 2 wide | 85 °C | Yes, 2 | Automatic dehumidification (thresholds not published) | Yes |
| Creality SpacePi X4 | $159 sale ($199) | 4 × 1 kg | 85 °C | Yes, 2 | Active dehumidification, per Creality | Yes |
| Elegoo H1 HT | $70 | 1 | 85 °C | Single spool | Vents seal after drying | Yes |
| SUNLU FilaDryer E2 | $249.99 sale ($349.99) | 2 × 1–2 kg, or 1 × 3 kg | 110 °C | No | Sealed chamber | Yes |
| Polymaker PolyDryer | From $29.99 (box) | 1 per box (XL: 3 kg) | About 70 °C | One box per dock | Sealed boxes with desiccant | Yes |
| Bambu Lab AMS 2 Pro | $359 | 4 | 65 °C | No | Sealed, vented storage | No |
| Bambu Lab AMS HT | $149 | 1 | 85 °C | Single spool | Sealed, vented storage | No |
How to use a filament dryer so it actually works
Most disappointing dryer experiences trace back to three mistakes: drying something that wasn’t the problem, trusting the display, and letting the spool sit out afterward. This is the routine we’d run with any dryer above.
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Confirm moisture is the problem
Listen for popping or hissing at the nozzle, and look for pitted walls, fuzz, and stringing that crept up over weeks rather than appearing overnight. Then print the same file with a spool you know is dry. If the problem follows the spool, it’s the filament. If it stays with the printer, a dryer won’t fix it, and our diagnostic guide is the next stop.
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Weigh the spool
Write down its weight before you dry it, ideally on a scale that reads to 0.1 g. Water leaving the plastic shows up as weight leaving the spool, the same loss-in-weight principle the plastics industry standardizes as ASTM D6980. The change on PLA or PETG is small, which is why a 0.1 g scale beats a kitchen scale; nylon moves a lot more.
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Make sure the spool can take the heat
SUNLU warns that the spool must be rated for whatever temperature you set, and Bambu Lab says its own reusable spools handle 80–90 °C. Cardboard spools also swell in humid air. If you need engineering temperatures, respool onto a spool rated for the heat first.
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Set temperature and time for the material
Start with your filament maker’s datasheet, then the table below. If spools share a chamber, set it for the most heat-sensitive one. Bambu’s wiki says the AMS caps drying at 45 °C when it dries during a print with PLA loaded, and it tells you to pull PLA and TPU out before drying hotter. Two independent chambers make this a non-issue.
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Let it vent, and keep the lid shut
SUNLU recommends opening the silicone plugs on the filament outlets while drying so moist air can escape, then closing them afterward. Opening the lid mid-cycle dumps the heat you’ve paid for. Dryers with automatic vents, like the H1 HT and Bambu’s AMS units, handle venting themselves.
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Judge by weight and trend, not the readout
Weigh again every couple of hours near the end. When two readings in a row match, the spool is as dry as that temperature will get it. The humidity display still helps as a trend: a reading that keeps falling means water is still coming out. Expect it to climb after the cycle as the box cools; that’s temperature, not failure.
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Print from it, or seal it within the hour
For long jobs in TPU, nylon, PVA, or PC, feed straight from the dryer through its PTFE port, using a hold or maintain mode if it has one. Otherwise, seal the spool with fresh desiccant right away. Bambu Lab’s figures say freshly dried filament in a typical 55% RH room can start absorbing moisture and printing worse within 2 to 12 hours.
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Label it
A strip of tape on the spool with the material, the date opened, and the date dried. Next time you’ll know whether it’s a print-now spool or a dry-first spool without guessing.
Starting temperatures and times
These are Bambu Lab’s recommendations for a forced-air oven, and your filament maker’s numbers override them. In a compact dryer, where the spool sits close to the heater, start at the bottom of each range and keep PLA around 45–50 °C, close to the 45 °C cap Bambu’s AMS uses for PLA.
| Material | Temperature | Time | Dry before use? | Desiccant while printing? | Your dryer needs to reach |
|---|---|---|---|---|---|
| PLA, PLA-CF/GF | 50–60 °C in an oven; 45–50 °C in a compact dryer | 8 h | Recommended | Optional | 45 °C |
| PETG, PETG-CF | 60–70 °C | 8 h | Recommended | Optional | 60 °C |
| TPU | 65–75 °C | 8 h | Required | Required | 65 °C |
| ABS, ASA | 75–85 °C | 8 h | Recommended | Optional | 75 °C |
| PC | 75–85 °C | 8 h | Required | Required | 75 °C |
| PVA, BVOH | 75–85 °C | 8–12 h | Required | Required | 75 °C |
| Nylon (PA), PA-CF/GF, PAHT-CF, PET-CF | 75–85 °C | 8–12 h | Required | Required | 75 °C |
| PPA-CF/GF | 100–130 °C | 8–12 h | Required | Required | 100 °C |
How to store filament so it stays dry
Think of the dryer as a reset button and storage as the thing that decides how often you press it. Bambu Lab’s numbers make the stakes plain. Most filaments need air below 20% RH to stay dry for an extended period, and lower buys more time: at 20% RH, Bambu estimates filament stays dry for roughly 2 to 7 days, while in a typical 55% RH room, freshly dried filament can start picking moisture back up within hours. Aim for 10–20% inside a sealed box, and treat anything above 20% as a problem to fix.
Filament lives in three places, and each needs a different level of protection.
On the printer
HoursThe spool you’re printing right now.
- Moisture-hungry materials, which Bambu Lab flags as needing desiccant protection during use (TPU, PC, PVA and BVOH, and the nylon family), should feed from the dryer or from a sealed box with desiccant for the whole job.
- Bambu’s wiki suggests rollers inside a sealed box for filament that can’t go in an AMS, like TPU, so it unwinds without extra drag.
- PLA and PETG can sit out for the length of a print in a normal room. Overnight in a damp garage is a different story.
- An AMS with fresh desiccant is fine for this week’s spools, not for months, and the AMS Lite has no enclosure at all. More in our AMS troubleshooting guide.
On the shelf
WeeksSpools you’ll use this month.
- Airtight bins with a gasket and latching lid. To test a seal, close the lid on a strip of paper; anywhere it slides out easily, air gets in.
- Indicating desiccant in every bin, regenerated before it’s fully spent. Polymaker’s instructions for its beads: 100–120 °C in an oven for 1–2 hours, or about 8 hours on its dock at power level 3. Bambu Lab says to replace AMS desiccant when it turns lumpy or pasty. Only bake packs sold as reusable.
- A hygrometer in every bin. Cheap ones drift, so check yours with the salt test: seal it overnight in a bag with a spoonful of table salt dampened to a wet-sand texture, not dissolved. It should read close to 75% RH, and the difference is your correction.
- Ten or more spools? A room-temperature desiccant cabinet keeps a whole shelf dry without heating it. We broke down SUNLU and INSLOGIC’s FilaDC i10, now on pre-order at SUNLU.
In the archive
MonthsSpools you won’t touch for a while.
- Vacuum bags with a desiccant pack inside, labeled with the material and dates.
- Keep archive bags indoors in a closet, not a garage. Closed garages run far hotter than the house in summer, especially inland, and PLA starts to soften in the 50s °C.
- Seal nylon the day you open it. Bambu Lab warns that nylon left in open air for around three months absorbs moisture so deeply it’s hard to dry at the 80–90 °C its reusable spools can handle.
- Don’t re-dry polycarbonate over and over. Bambu says repeated drying and cooling cycles build thermal stress that makes PC brittle. Store it sealed after each drying, and a well-protected spool needs only a short top-up next time (Bambu suggests about 2 hours).
A simple upkeep schedule
- Every time you open a bin
- Glance at the hygrometer, then reseal within the hour.
- Weekly
- Check the desiccant color in the bins you’re using.
- When desiccant turns
- Regenerate or swap it. If it turned fast, find the leak.
- Every few months
- Salt-test your hygrometers and reseal any archive bag that’s gone soft.
- Every new spool
- Write the open date on it. Moisture-hungry materials go straight into sealed storage.
What drying costs on SDG&E
SDG&E’s April 2026 rate notice puts its bundled residential average at 46.4 cents per kWh. Here’s the worst case for one cycle, assuming the heater runs at the maker’s rated power the whole time. It won’t: PTC heaters throttle back once they reach temperature, so real use is lower.
| Dryer | Power, per maker | Cycle | Energy, worst case | Cost, worst case |
|---|---|---|---|---|
| SUNLU FilaDryer S4 Pro | 380 W rated | 8 h | 3.04 kWh | $1.41 |
| Sovol SH03 | 400 W rated | 8 h | 3.2 kWh | $1.48 |
| SUNLU FilaDryer E2 | 500 W heater | 12 h | 6 kWh | $2.78 |
| Bambu Lab AMS HT | 150 W average | 8 h | 1.2 kWh | $0.56 |
Even the worst case is a dollar or three per cycle. The expensive habit is using a heater as storage: every 50 W of average draw, around the clock, adds up to 1.2 kWh a day, about 56 cents a day or roughly $17 a month at that average rate. A sealed bin with desiccant costs nothing to run, so save hold modes for spools you’re about to print, and schedule long cycles outside SDG&E’s 4–9 p.m. on-peak window.
Printable upgrades for dry storage
A few printed parts make any storage setup work better. Search Printables or MakerWorld for these, or send us the file and we’ll print it for you.
Hub desiccant cartridge
A vented cup that sits in the spool’s center hole, so every spool carries its own desiccant into the AMS or dry box.
Rides in the dryer? ASA or ABSHygrometer lid mount
Holds a small hygrometer where you can read it without opening the bin.
Room temperature: PETG or PLARoller base
Lets spools turn freely inside a sealed box. Bambu Lab recommends rollers for dry boxes that feed TPU.
PETGSealed PTFE pass-through
A bulkhead fitting with a gasket, so filament leaves the bin without leaving a hole open. Add a plug for when nothing’s feeding.
PETGDate-dried clip
Clips to the spool rim, with a writable face for the material, date opened, and date dried.
PLA or PETGPolyDryer XL dock adapter
Polymaker publishes a printable adapter for its Box XL and recommends ABS or ASA because of the dock’s heat.
ABS or ASARule of thumb: anything that sits inside a running dryer should be ASA, ABS, or PC. PLA softens near drying temperatures, and PETG gets soft near the top of an 85 °C cycle.
San Diego notes
- Coast: mornings are the wettest part of the day. Humidity at the airport station averages about 80% at dawn from June through September, so in a coastal garage, sealed storage is the default, even for PLA.
- Inland: the bigger threat is heat. Closed garages in August run far hotter than the house, and PLA starts to soften in the 50s °C, so keep spools indoors.
- Power: SDG&E’s rates are among the highest in the country, one more reason to let desiccant, not a heater, do the storage work.
- Before you order parts: if your printer started acting up when the marine layer rolled in, test with a dry spool first. It’s free, and it’s the fastest way to split a filament problem from a printer problem.
Not sure if it’s the filament or the printer?
Wet filament and hardware faults look alike: stringing, popping, weak layers, jams. We diagnose both across San Diego County, on site or at our Carmel Valley shop, and we’ll tell you if the fix is a dry spool instead of a part. We can also print the storage parts above in ASA or PETG, from $7 an hour of machine time plus material.
Request a repair or printCall or text 858-342-6984
Email dreaming3dprinting@gmail.com
Instagram @dreaming3dprinting
What we don’t take on: metal printing, flight hardware, firearm components, load-bearing or safety-critical parts, and patient-contact medical devices.
Common questions
What is the best filament dryer for 2026?
For most home setups, the SUNLU FilaDryer S4 Pro ($139.99): four spools in two independently controlled chambers, up to 85 °C, with a humidity-hold mode. The Sovol SH03 ($109 on sale) is the best value, the Elegoo H1 HT ($70) the best single-spool pick, and the SUNLU FilaDryer E2 the pick for engineering filaments that need more than 85 °C. Prices were checked September 21, 2026.
Does PLA need to be dried?
Bambu Lab rates drying PLA as recommended rather than required. In practice, a PLA spool left open for weeks in coastal San Diego humidity often prints cleaner after a gentle dry around 45–50 °C in a compact dryer. Sealing it afterward matters more than the drying.
How long should I dry filament?
Bambu Lab’s guidance is about 8 hours for most materials and 8–12 hours for nylon, PVA, and similar moisture-hungry filaments. The reliable way to know you’re done is to weigh the spool: when two weigh-ins a couple of hours apart match, it’s as dry as that temperature will get it.
Why does my dryer show 5% humidity when my prints still string?
Warm air reads low relative humidity even when the water hasn’t gone anywhere, so a hot dryer’s display says little about the filament. Watch whether the reading keeps falling, and confirm with a scale. If a spool you know is dry strings too, check nozzle temperature and retraction settings before blaming moisture.
Can I leave filament in the dryer as storage?
Yes, if the dryer seals well, and a humidity-hold mode is handy for spools you’re about to print. For everything else, a sealed bin with desiccant is cheaper to run at SDG&E rates, and it avoids the repeated heating cycles that Bambu Lab says make polycarbonate brittle.
What humidity should filament be stored at?
Below 20% relative humidity, per Bambu Lab, and lower is better. Aim for 10–20% inside a sealed box, check it with a hygrometer, and verify the hygrometer with a salt test, which should read close to 75%.
Can I dry filament in my kitchen oven?
Bambu Lab advises against both kitchen ovens and microwaves. Kitchen ovens heat unevenly, and hot spots near the elements can deform spools and filament. A forced-air lab oven is a different tool; at home, a dedicated filament dryer is the practical option.
Do I need a dryer if my Bambu AMS has desiccant?
Desiccant keeps dry filament dry; it doesn’t rescue a spool that’s already wet. The AMS 2 Pro can dry, but only to 65 °C, which Bambu Lab says isn’t enough to fully dry ABS, ASA, nylon, PC, or PVA. The original AMS and the AMS Lite don’t dry at all, and the AMS Lite isn’t sealed.
Can Dreaming3D help with moisture problems in San Diego?
Yes. We diagnose printers across San Diego County, on site or at our Carmel Valley shop, and we check the filament before we blame the printer. Call or text 858-342-6984, or book at dreaming3d.net/pages/repair-request.
Keep reading
What does your storage look like: bins, PolyDryer boxes, vacuum bags, or a cabinet? And what’s the lowest humidity you’ve actually held through a San Diego summer? Tell us in the comments.
Sources and notes
- Bambu Lab Wiki, filament drying recommendations. Drying temperatures and times, desiccant requirements, the under-20% RH storage guidance, the 2–12 hour and 2–7 day re-absorption estimates, and the nylon and PC notes.
- Bambu Lab Wiki, AMS 2 Pro drying function. Automatic temperature caps when drying while printing, and the instruction to remove PLA and TPU before drying hotter.
- Bambu Lab store, AMS 2 Pro. Price, 65 °C limit, materials it can’t fully dry, printer connection and power-adapter requirements.
- Bambu Lab store, AMS HT. Price, 85 °C limit, bypass outlet, 150 W average power.
- SUNLU, FilaDryer S4 Pro. Price, dual-zone control, 45–85 °C, 380 W, humidity-hold thresholds, chamber size.
- SUNLU, FilaDryer E2. Price and stock status, 35–110 °C, 500 W, spool size, humidity-sensor protection mode, venting and spool-rating advice.
- Sovol, SH03. Sale and list price, 2 × 200 W heaters, 45–85 °C, 400 W, spool widths, presets, noise.
- Creality, SpacePi X4. Sale and list price, dual independent chambers, 85 °C, active dehumidification.
- Creality, Space Pi V2 Plus. Price, stock status, two spools, 45–70 °C.
- Elegoo, H1 HT. Price.
- Elegoo launch announcement for the H1 HT (PR Newswire). Launch date, 85 °C, rotation, vents, bypass outlet.
- Polymaker, PolyDryer. Prices, 68–73 °C top range, desiccant regeneration, Box XL, and Polymaker’s humidity test results.
- All3DP, filament dryer roundup (July 2026). PolyDryer dock-and-box price, SpacePi X4 heater wattage, Sovol SH01 and SUNLU S2 temperatures.
- 3DPrinting.com, best filament dryers (2026). SpacePi X4 desiccant regeneration, SUNLU S1 Plus temperatures.
- NOAA Comparative Climatic Data, average morning and afternoon relative humidity (Golden Gate Weather Services table). San Diego airport station, period of record 1948–2015. Dataset overview at NCEI.
- SDG&E electric rate change alert, April 2026. Bundled residential average of 46.4 cents per kWh.
- ASTM D6980, moisture in plastics by loss in weight. The standard behind the weigh-your-spool method.
- Chart curves use the Buck vapor-pressure equation (1996 form) at 1013.25 hPa. The salt test relies on the roughly 75% RH that saturated table salt holds at room temperature (Greenspan, NBS Journal of Research, 1977).
Dreaming3D Inc. isn’t affiliated with SUNLU, Sovol, Creality, Elegoo, Polymaker, or Bambu Lab, and none of the links in this post are affiliate links. Specs and prices come from each manufacturer’s US store or documentation as of September 21, 2026, and change often. Figures attributed to a maker are that maker’s claims; we haven’t independently measured them.