The Polydryer system is a great concept, but poorly executed. The dryer base leaves a lot to be desired, it doesn’t come close to producing the industry recommended temperatures for the filament groups. Polymaker claims 50/60/70ºC for the 3 levels, but those are AT the heat output grille, not in the central volume of the box where it counts. Air cools off significantly when it expands out into the box. I measured roughly at the spool center height, and about where the surface of a half-spool of filament would be, and got 40.5/48.9/57.2ºC – rather pathetic. This poor performance has been noted by a couple of YouTube reviewers as well. Fortunately, there is a simple mechanical tweak one can make to bring each temperature much closer to the desired 50/60/70. Ya need a phillips screwdriver, open it up and move the thermistor as far to the right as the wire will allow. You’ll get about 5-6ºC more at each level. Even then, the heat isn’t distributed evenly. Air moving up & over the top of a spool of filament looses about 5ºC in transit. So the side of the spool nearest the outlet gets hotter than the side opposite the outlet. It’s really up to Polymaker & FabNotion to address these shortcomings.
