Sovol SH04 4-Spool Filament Dryer: problems, parts and running costs

Checked: 2026-10-07

Summary

The Sovol SH04 is a four-spool filament dryer box with four PTFE feed-throughs and a fixed 50°C target that cycles between 45°C and 55°C. Owners report a loud unit with a bent fan that needs substantial disassembly to repair, and the box is sold out at the accessible US listing. Running cost is electricity only, about $32 to $75 a year at six hours a week at the 690 W maximum before thermostat cycling, with no subscription. At $65 or less it is a good buy; above $90 skip it unless the four-spool form factor is the whole point.

Common problems and fixes

Fixed 50°C target with no adjustment — Sovol recommends 65°C for PETG and ABS and 75°C for nylon and PC, all above the 45°C to 55°C control band, so all four spools share one zone. [3][14]
Loud unit with bent fan — a February 2025 owner reported a loud unit with a bent fan; Sovol gave troubleshooting steps and later sent a replacement fan, but the repair needed substantial disassembly. [8]
Wish for more heat — a July 2026 owner wished the box could run about 10°C hotter. [9]
Timer stops at two hours — longer drying needs continuous mode and manual shutdown. [3]
Poor availability — Sovol’s dryer collection lists the SH01, SH02 and SH03 but not the SH04, and the accessible US listing is sold out. [7][14]
No independent test — no lab test of drying rate, temperature uniformity, noise or energy use exists. [5][8][15]

Parts and consumables

Heating bars, thermostat and knob assembly — no public consumer replacement listing found. [3][6]
Desiccant — not listed as an included or required consumable. [3]

Yearly running cost

At the 690 W maximum, two hours at full draw is 1.38 kWh, about $0.21 to $0.48 at an illustrative $0.15 to $0.35 per kWh. Six hours a week at that ceiling is about 215 kWh a year, roughly $32 to $75, and actual draw should be lower once the thermostat cycles within the 45°C to 55°C band. There is no subscription or routine proprietary consumable. [1][3][15]

When it is a good buy

Electroeshop shows $88.14 but sold out. [7] At $65 or less the SH04 is a good buy for users who need four spools feeding from one simple box and accept the fixed 50°C target. [1][3] From $66 to $80 it is only fair because newer four-spool dryers offer broader temperature control. [3][11][12] From $81 to $90 value is weak, since Sovol’s newer SH03 costs $109 direct and reaches 85°C with two independent chambers. [7][13] Above $90 skip the SH04 unless its exact form factor is uniquely useful; the SUNLU S4 is $116.99 direct and reaches 70°C, and the Creality SpacePi X4 is $159 and reaches 85°C with two independent chambers. [11][12] Alternatives: Sovol SH03 when higher temperature or independent chambers are needed; SUNLU FilaDryer S4 when 70°C is enough with adjustable humidity control; Creality SpacePi X4 for nylon and engineering filament at 85°C. [11][12][13]