I’ve had the Polymaker PolyDryer for about two months, and it falls well short of expectations. Using the same methodology I applied in my Sunlu S2 vs. Creality Space Pi Bake-Off Review, I found the PolyDryer has only one real use in my setup: drying the desiccant inside my cereal box filament drybox, based on this design:
(The printable duct adapter integrates well.)
Here’s a breakdown of where the PolyDryer falls short:
- Insufficient drying temperature – It never exceeds 60°C in my tests, regardless of test point, which is inadequate for drying PETG in under 12 hours.
- Poor value – As a dry box, it’s wildly overpriced. My cereal box setup, including hygrometer and rollers, costs under $10 and outperforms it.
- High acrylic box cost – The clear acrylic case is admittedly well-made (and nearly $25 on its own), but the total package doesn’t justify its price given the underwhelming performance.
- Undersized desiccant tray – Holds less than 30g of desiccant, compared to 75–90g in the cereal box build.
So why did I buy it? It was on sale for $60 with free shipping. At that price, I saw it as a convenient way to regenerate desiccant inside my sealed cereal box system - without having to open or remove anything. For that very specific use, it’s fine. At full price, it’s a waste.
Here’s what the adapter looks like:
