EIBOS Filament Dryer Cyclopes 2 Rolls, Adjustable Temp Max 70C, Humidity Sensor, Infinite Timer Review (2026)

Two spool capacity and layout

This dryer is built to hold two full size rolls of filament at once, or reportedly smaller half kilogram rolls in greater number, using a fan driven hot air system to circulate heat evenly around both spools rather than relying on a single still air chamber. That two roll capacity is the main differentiator from single spool dryers at a similar price, and it matters for anyone running multi material or multi color prints who would otherwise need two separate dryer boxes, or for anyone drying a backup roll while actively feeding filament from the other. The listed compatibility spans 1.75mm, 2.85mm, and 3.00mm filament diameters, covering the vast majority of desktop printer spool sizes.

Temperature range and what it covers

The dryer heats from roughly 30C up to a maximum of 70C, with temperature control accurate to within a couple of degrees of the target setting, using a PTC heating element paired with a circulation fan. That top end comfortably covers the drying needs of PLA, PETG, and TPU, which are among the most commonly used filaments and generally dry well well below 70C. Filaments that call for higher sustained drying temperatures, such as some nylon or polycarbonate blends, may not fully dry in this unit within a reasonable timeframe, since their recommended drying temperatures can exceed what this dryer reaches at its maximum setting.

Humidity sensor and monitoring

A built in humidity sensor with its own digital display tracks the moisture level inside the chamber, measuring across a wide percentage range, which lets users watch drying progress in real time rather than guessing based on a fixed timer alone. This is genuinely useful feedback, since different filament types and different starting moisture levels need different drying durations, and a humidity reading gives a concrete signal for when a roll has actually reached a low, dry state rather than just having been in the box for a preset number of hours. It also helps catch a roll that started especially wet and needs longer than usual.

Infinite timer and use as storage

Beyond fixed duration drying cycles, this dryer includes what is described as an infinite or continuous timer setting, letting it run indefinitely rather than shutting off after a set number of hours. That makes it practical to use as ongoing heated storage for filament that is actively being printed from, keeping moisture at bay between print jobs rather than only during a dedicated drying cycle. Combined with the two spool capacity, this means a print can pull filament directly from a roll sitting inside the warm, low humidity chamber, which is a meaningfully different workflow than a dryer meant only for pre print drying sessions.

Who should buy this dryer

This is a good fit for anyone managing two spools of PLA, PETG, or TPU regularly, especially multi material or multi color printer owners, and for anyone who wants the option to keep printing directly from a roll stored inside a low humidity, gently heated box rather than drying in a separate step. It is a weaker match for anyone whose primary filament needs are nylon, polycarbonate, or other engineering materials that call for higher sustained drying temperatures than this unit's 70C ceiling provides, where a dryer with a higher maximum temperature would be a better long term investment.

Frequently asked questions