Direct answer: For a new purchase, compare the SUNLU S2 with Creality's current Space Pi V2—not with the original Space Pi as if it were still the same direct-store product. On Sept. 23, 2026, Creality's old Space Pi URL redirected to Space Pi V2, whose official product data listed a 75 C ceiling and an available variant. The original comparison remains useful for owners and verified remaining or used stock.
Choose SUNLU S2 when one spool, a listed 70 C ceiling, its large status display, and upper-and-lower heating layout fit the job. Consider Space Pi V2 when the current Creality route, listed 75 C ceiling, 360-degree hot-air circulation, and second-generation sensor matter. Buy the original Space Pi only when its exact 70 C model identity, condition, support, and price are clear.
The answer in 30 seconds
Buy SUNLU S2 if: one everyday spool at a time is enough and its 70 C status-first workflow matches the materials you actually dry.
Consider Creality Space Pi V2 if: a current first-party path, the listed 75 C ceiling, 360-degree hot-air circulation, and second-generation sensor justify choosing Creality today.
Buy the original Space Pi only if: the exact 70 C unit is verified remaining or used stock at a price that compensates for its older purchase path. Skip this class if you need multiple ready spools, oversized rolls, or a supplier condition above the selected dryer and spool limits.
Disclosure: GoodPrints may earn a commission from qualifying links on this page. This comparison uses current manufacturer-published information and current product-listing checks; it does not claim hands-on testing. Availability, variants, bundles, and pricing can change.
Check the exact model before comparing
This page's historical head-to-head covers the SUNLU FilaDryer S2 and the original single-spool Creality Space Pi. Space Pi V2 is a different current revision; Space Pi Plus, Space Pi X4, SUNLU S4, and SUNLU SP2 are different capacity or spool-size lanes. Verify the full selected title, temperature ceiling, number of bays, seller, voltage, power supply, and return path.
Current-model check, Sept. 23, 2026: the prior Creality URL now redirects to Space Pi V2. Creality's exact V2 product data listed one available variant, a 75 C ceiling, 360-degree hot-air circulation, and a second-generation smart sensor. Do not reuse the original Space Pi's 70 C and 48-hour comparison cells as V2 specifications.
Quick comparison
| Decision point | SUNLU S2 | Original Creality Space Pi |
|---|---|---|
| Purchase status checked Sept. 23, 2026 | Current SUNLU product page remained live | Old Creality URL redirects to Space Pi V2; V2 product data listed an available variant |
| Class | Single-spool heated dryer/storage box | Single-spool heated dryer |
| Listed maximum | 70 C | 70 C |
| Heat approach | Upper and lower heating plates plus bottom circulation fan | 360-degree PTC hot-air heating |
| Controls SUNLU/Creality highlights | 4.6-inch LCD with temperature, time, humidity, filament type, and countdown | 45-to-70 C control, 0-to-48-hour timer, and real-time temperature/humidity monitoring |
| Best fit | Status-first one-spool workflow | Timer-first one-spool workflow |
| Shared limit | One active spool and a 70 C listed ceiling do not cover every engineering-material, oversized-spool, or multi-printer need. | |
The table shows why this is a workflow decision rather than a temperature contest. A shared maximum does not prove identical chamber uniformity, spool-core temperature, moisture removal, warm-up behavior, noise, or recovery time. Those require the same-spool test described below.
Where the SUNLU S2 wins
The display is the clearest documented difference
SUNLU explicitly lists a 4.6-inch LCD showing temperature, time, humidity, filament type, and countdown. That is useful when the dryer sits within sight and you want one glance to answer whether the cycle is active, what it is doing, and how long remains. Read the SUNLU S2 specifications guide before treating screen size alone as proof of better drying.
Its heating architecture is stated more explicitly
SUNLU describes upper and lower heating plates with a bottom fan for all-around circulation. That documentation makes the intended heat path easy to understand. It still does not replace a measured spool test: the useful question is whether the center of a real spool reaches and holds the condition required by that filament without damaging the spool or material.
SUNLU S2 is the cleaner pick when those display and heat-layout differences are the features you will actually use. If the choice is mostly budget positioning, compare the budget single-spool S2 route without assuming the lowest listing price is the lowest complete ownership cost.
Where the original Space Pi can still make sense
Its 48-hour timer can still suit a verified legacy buy
Creality documents timer control from 0 to 48 hours. That can fit overnight cycles, longer scheduled recovery, or a drying window that starts before a print. A long timer does not mean every filament should be held at the maximum temperature for 48 hours. Use the filament manufacturer's condition and check the spool's temperature rating.
Its PTC hot-air design is straightforward to route into a daily process
Creality lists 360-degree PTC hot-air heating, adjustable 45-to-70 C temperature, and real-time temperature and humidity monitoring. Those controls are a credible middle lane for PETG, TPU, ABS, and other common moisture-sensitive spools when the listed drying condition fits. The Space Pi specifications guide covers the exact-product questions that a comparison table cannot.
When an exact unit is available, Creality Space Pi Filament Dryer is the better fit when that timer and PTC-control pattern removes real friction. Do not confuse it with Space Pi Plus, which is the two-spool capacity branch.
Current original-model purchase check: the stored original single-spool Creality Space Pi listing on Amazon passed fresh exact-identity, in-stock, and active-purchase-control checks on October 22, 2026. Treat it as a remaining-stock route for the original 45-70 C model discussed in this comparison, not as Space Pi V2. Before checkout, verify the exact title, one-spool capacity, 70 C ceiling, seller, voltage, included parts, and return path; if the selected page or delivered label says V2, use the V2 specifications instead.
Run a five-cycle proof test instead of comparing slogans
- Choose one moisture-sensitive spool whose supplier drying instructions fit both dryers.
- Record starting mass, room conditions, spool dimensions, and visible or audible wet-filament symptoms.
- Use the same target temperature and time in each dryer.
- Keep the same outlet routing, lid state, printer, profile, and test model.
- Log warm-up behavior, displayed humidity trend, noise, feed resistance, and interruptions.
- Print the same diagnostic geometry after each cycle.
- Inspect stringing, bubbling, surface roughness, layer consistency, and extrusion stability.
- Repeat across five cycles rather than trusting one unusually wet or unusually easy spool.
- Check whether the spool rewets in the box after heat turns off.
- Keep the unit that produces repeatable parts with less operator friction.
If both perform the same on your actual material, choose by interface, footprint, spool fit, and support path. If neither fixes the symptoms, confirm moisture is the cause before buying a hotter or larger dryer; the wet-filament diagnostic separates moisture clues from nozzle, temperature, retraction, and extrusion problems.
Drying is not sealed storage
A heated box can recover a spool, but it does not automatically become the best long-term low-humidity store after power is off. Moisture must leave the chamber during recovery, and a dry spool must then stay dry. Compare desiccant, seals, tubing, and turnover in filament dryer vs dry box vs sealed storage.
This matters most for PETG, TPU, nylon, and filled materials that may sit between jobs. A single-spool dryer works well when one spool moves directly from recovery to printing. It becomes awkward when several printers or materials must remain ready at once.
Who should skip both?
- Multi-spool benches: route to a two- or four-spool dryer when concurrent ready capacity saves repeated swaps.
- Oversized spool users: verify diameter, width, bore, and loaded weight before assuming a standard one-kilogram fit proves compatibility.
- High-temperature engineering-material users: follow the material supplier's condition. A 70 C ceiling is not automatically enough for every nylon, PC, or composite workflow.
- Mostly dry PLA users: sealed storage and fresh desiccant may solve the actual problem more cheaply.
- Unclear symptoms: diagnose before buying. Heat will not fix a worn nozzle, partial clog, bad temperature profile, or poor extrusion path.
Final recommendation
Buy SUNLU S2 when one-spool 70 C drying, its large documented display, and top-and-bottom heating layout fit your actual materials. It is the cleaner direct answer inside the original matchup.
For a current Creality purchase, evaluate Space Pi V2 on its own terms. Its official data lists 75 C, 360-degree hot-air circulation, a second-generation sensor, and an available variant; those are not the original Space Pi's comparison cells.
Buy an original Space Pi only as a verified remaining-stock or used 70 C unit when the exact model, condition, seller, warranty or return path, and discount all make sense. For several active spools, larger rolls, or hotter supplier requirements, use the PETG and TPU dryer buyer guide or the SUNLU S4 vs Space Pi X4 comparison.
Lifecycle check: on Sept. 23, 2026, the exact SUNLU S2 remained the live S2 purchase path, while Creality's former Space Pi URL redirected to the current Space Pi V2. Recheck the selected model and purchase controls before checkout.
Frequently asked questions
Do SUNLU S2 and the original Creality Space Pi reach the same maximum temperature?
Yes. The historical comparison uses the manufacturers' listed 70 C ceilings for S2 and the original Space Pi. That does not prove identical spool-core temperature or drying speed, and it does not apply to Space Pi V2.
Is Space Pi V2 the same dryer as the original Space Pi?
No. Creality's current V2 product data lists a 75 C ceiling, 360-degree hot-air circulation, and a second-generation sensor. Treat V2 as the current successor and verify its exact specs rather than inheriting the original model's 70 C and timer claims.
Which one is better for PETG or TPU?
Either can fit when the filament supplier's drying condition is within the machine and spool limits. Choose by spool fit, feed path, controls, and the repeated five-cycle test rather than material name alone.
Can I print directly from either dryer?
Plan the outlet and tubing route before buying and check the exact manual or listing for the selected version. A usable path should not add tight bends, excessive drag, or an unstable spool feed.
Should I buy a two-spool dryer instead?
Yes when two active spools repeatedly need recovery or dry-while-printing access at the same time. Do not buy capacity for a hypothetical future bench.
Does a humidity display prove the filament is dry?
No. Chamber humidity is a useful trend, not a direct measurement of water inside the spool. Confirm with repeatable print behavior and the supplier's drying condition.
Manufacturer references
- SUNLU FilaDryer S2 product page — current S2 identity and 70 C documentation checked Sept. 23, 2026.
- Former Creality Space Pi product URL — redirects to Space Pi V2 as of Sept. 23, 2026.
- Creality Space Pi V2 product page — current V2 identity, 75 C ceiling, circulation, sensor, and availability data.
If this page is turning into a real next-step decision, start here
This single-spool dryer comparison works better when it gives readers one cheaper default, one cleaner middle lane, and one bare-minimum starter off-ramp instead of pretending every single-spool buyer is choosing from the same angle.
If the real answer is staying near the lower-cost end because you want a more useful starter dryer without paying for a cleaner premium story yet: the SUNLU S2 is the cleaner default. It fits readers who still care most about cost but want the purchase to hold up better than the flimsiest entry tier. The tighter on-site handoff is this SUNLU S2 vs Space Pi comparison.
If the better move is paying for the calmer middle lane because everyday PETG, TPU, and regular spool recovery should feel less janky: the Creality Space Pi is the tighter step-up when an exact unit is available. It matches buyers who care more about the smoother everyday workflow than shaving every last dollar off the dryer choice. The tighter on-site handoff is the Space Pi review.
If you are still earlier in the buying curve and mainly want the cheapest honest first experiment before you decide to care more: the eSUN eBOX Lite is the budget-first off-ramp. It fits readers who are still solving for ?do I even need a dryer?? before they optimize the lane. The tighter on-site handoff is the eBOX Lite vs SUNLU S2 comparison.
That keeps the monetization compact and reader-fit: one lower-cost default, one cleaner mid-range choice, and one budget-first off-ramp for buyers who are still testing whether dryer ownership belongs on their bench at all.