Filament Dryer Box Review — Sovol SH01 Power-Off Storage

Filament Dryer Box Review — Sovol SH01 Power-Off Storage

A $39.59 two-spool box with a silicone and PTFE seal for power-off storage and room for four desiccant bags — and a listing that admits it cannot reach its own top temperature in a cold room. We score this filament dryer box 7.8 out of 10.

This review is research-based. We did not physically test these products; specifications, ratings and prices are taken from the live listings on the date shown. This filament dryer box is one of five compared in our best filament dryer guide.

Filament dryer box — Key Specifications

Two Spools and a Seal That Works With the Power Off

The capacity is the reason to choose this over the single-spool SUNLU: two reels under 70 mm wide, or one wide
reel up to 150 mm. For anybody alternating PLA and PETG that removes the need for a second appliance, and at $39.59 it
costs $7.30 more than a box that holds one.

The power-off mode is the other half of the argument. A silicone and PTFE seal means the box functions as sealed
storage when it is not heating, with space for four desiccant bags inside, so filament lives in it rather than
visiting it. Sovol is clear that the desiccant is not included, which is more than some rivals manage.

A Filament Dryer Box That Admits It Cannot Reach Its Own Top Setting

This is the most candid sentence in the entire comparison and it is worth quoting: if the box is used in a room
below 16°C, the temperature inside will not come up to 50°C. That is a manufacturer publishing the limit of its own
heating element, and no other listing here does anything comparable.

It is also the moment the listing stops being candid, because the very next clause is a reassurance with nothing
behind it: do not worry, this would not decrease drying effect. Drying is a function of temperature and time. A box
that cannot reach its setpoint is drying more slowly, and saying otherwise contradicts the admission that precedes
it. The honest version would have been to state the derated temperature.

Three Temperatures, and Why the Middle One Is Usually Right

There is no dial here — the choice is 40, 45 or 50°C, and 6 to 12 hours. In practice that is less limiting than
it sounds, because 45°C is a sensible setting for PLA and 50°C covers PETG, ABS and TPU adequately. What it rules out
is fine control, and what it rules out absolutely is engineering filament.

One instruction in the listing deserves attention because it is counter-intuitive: the PTFE seals on the top of
the box must be opened while it is heating, so that evaporated moisture can leave. A sealed box that is sealed during
the drying cycle is simply a warm humid box. Open while drying, closed while storing.

It is worth being clear about why the star rating sits lower here than on boxes that are otherwise similar. A 4.2 across 2,918 ratings is a large enough sample to mean something, and the cold-room ceiling is the most plausible explanation: a buyer in an unheated workshop ends up with a box that never reaches the number on its own display, finds the caveat afterwards, and scores it accordingly. The hardware is not worse than its rivals. The envelope it works in is narrower, and Sovol is the only maker in this group that says so on the listing.

Filament dryer box — Limitations

The cold-room admission is a real constraint, not a footnote. A garage, shed or unheated spare room below
16°C — which describes a great many British and northern-American workshops for much of the year — means this box
never reaches 50°C at all. The three-step temperature menu gives no way to compensate.

Fifty degrees is the ceiling, so nylon, polycarbonate and PAHT are out, and PETG is being dried at the bottom of
its useful window rather than the middle. The fixed steps also mean there is no setting below 40°C for the most
heat-sensitive materials.

The lowest star rating in this comparison at 4.2, across 2,918 ratings — a large enough sample that the figure
means something. The Manufacturer Part Number field reads simply “/”, and Item
Diameter reads 2.85 mm, describing filament rather than the box.

Desiccant is not included despite four bays being a headline feature, and as with every unit here the box shows a
humidity percentage without ever stating which percentage is dry enough.

Setting Up This Filament dryer box

Open the PTFE seals on the top before starting a cycle and close them when it finishes. This is the step the
listing specifies and the one most likely to be skipped, and getting it wrong converts the appliance into a warm humid
container. Open to dry, closed to store.

Check the room temperature before trusting the display. Below 16°C the box will not reach 50°C by Sovol’s own
admission, so a cold workshop means running longer cycles — 12 hours rather than 6 — or moving the box somewhere
warmer for the drying run.

Buy desiccant separately and load all four bays. The seal and the sachets are what make this useful between prints,
and they are the part of the purchase Sovol leaves to the buyer. Two narrow spools fit; one wide spool up to 150 mm
also fits, so measure before loading.

Who Should Buy This Filament dryer box?

Anyone who needs two materials dry at once on a budget, and anyone who wants a dryer that doubles as sealed
storage without paying Polymaker’s prices. Two spools, a real seal, four desiccant bays and a one-year warranty for
$39.59 is a fair deal in a warm room.

Skip it if the workshop is cold, because the listing itself says the box will not reach 50°C below 16°C ambient.
Skip it too if engineering filament matters, or if fine temperature control matters — three fixed steps and a 50°C
ceiling are the whole range.

The Verdict

As a filament dryer box this does the two things its price bracket should: it holds two spools instead of
one, and it seals well enough to work as storage with the power off, with four desiccant bays inside. The built-in fan
for even heating and the real-time temperature and humidity readout are competent, and a one-year warranty is stated
plainly where two rivals state nothing.

It scores 7.8 because of what its own listing concedes. A box that cannot reach 50°C below a 16°C room
temperature has a narrower working envelope than the specification implies, and following that admission with an
unsupported assurance that drying is unaffected is the weakest moment in any of these five listings. At 4.2 it also
carries the lowest owner rating in the group. Good value in a warm room; a compromise in a cold one.

Filament dryer box — Frequently Asked Questions

What temperatures can this filament dryer box be set to?

Three fixed settings — 40°C, 45°C and 50°C — with a 6 to 12 hour timer. There is no continuously adjustable range, and 50°C is the maximum.

Does it really not reach 50°C in a cold room?

Sovol’s own listing states that in a room below 16°C the temperature inside the box will not come up to 50°C. The listing then says this would not decrease the drying effect, which is an assurance it does not support — a lower temperature means slower drying.

Should the box be sealed while it is drying?

No. The listing instructs you to open the PTFE seals on the top during heating so that evaporated moisture can escape, and to close them when storing filament with the power off.

How many spools does it hold?

Two spools up to 70 mm wide, or a single spool up to 150 mm wide. There is also room for four bags of desiccant, which are not supplied.

Where to Buy

Check Price on Amazon

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Full comparison: Best filament dryer guide.