eSUN eBOX: problems, parts and running costs

Checked: 2026-10-17

Summary

The eBOX is a compact filament drying and storage box whose recurring complaints are noise and moisture: the circulation fan is quite noisy, the mechanical relay clicks about once a minute, and condensation pools at the top of the chamber. The only consumable is desiccant, which the manual says to take from the filament’s original packaging, so running costs are essentially electricity. It is a strong buy near the $46.99 sale price eSUN’s US store ran in January 2023 and harder to justify at the $99.99 its own store lists now.

Common problems and fixes

Fan and relay noise — the circulation fan is described as “quite noisy” and the mechanical relay “makes a clicking sound almost every minute” because the controller watches the heating plate, not the air. No factory fix; expect to hear it if the box sits near your desk or bed. [7][8]
Condensation at the top of the chamber — moisture driven out of the filament has nowhere to go. Fix: owners cut a hole in the cover and add a small fan to force moisture out; the manual advises against opening the box while temperature is being lost during drying. [1][10][13]
No humidity sensor — the unit cannot report chamber humidity, which one owner called a significant omission for a drying device. Fix: add your own hygrometer. [8]
Scale needs a one-time setup — after power-on the weight clears automatically and gram readings mean nothing until you enter WOC mode and set the empty-tray weight. Fix: follow the manual’s tare step. [1]

Parts and consumables

Desiccant — the only consumable; the manual advises using the desiccant from the filament’s original packaging, so it costs nothing extra. [1]
No manufacturer parts catalog — eSUN’s product page says “DO NOT disassemble or repair it on your own”, and no spare parts are sold; a community mod culture (mounts, fan guards, roller-bearing upgrades) exists on Thingiverse. [6][7][8]

Yearly running cost

The only consumable is desiccant, which the manual sources from the filament’s original packaging, so consumables cost $0 a year. The 36 W heater is the only draw; no owner has published an electricity estimate, and there is no subscription and no repair schedule. [1][7]

When it is a good buy

eSUN’s own store lists the eBOX at $99.99 (checked 2026-10-14); at that price it is weak-to-fair against newer insulated dryers unless the built-in scale and compact footprint are the deciding features. [6]
eSUN’s US store ran a $46.99 sale (discounted from $79) in a 2023-01-31 sponsored review; at that price it is a strong budget buy. [7]
Smith3D (Malaysia, authorized dealer) lists RM 175.00-180.00, currently sold out (checked 2026-10-14). [3]
An EEVblog owner paid 42 pounds delivered from TomTop in December 2018. [8]
eBOX Lite ($52.99 in eSUN’s comparison table) — the better choice when you want insulation and do not need the built-in scale. [7]
eBOX Pro (64 W heater) — the better choice when you dry Nylon or PC and need more heat than the eBOX’s 50 degrees C inside air. [5][7]