Take something like the Sunlu S4 air heater, blower fan, but also add LARGE desiccant containers and install that below and to rear of spool holding areas. Bring in air from area AMS is located, run through desiccant towers/chambers (2) so you can dry a tower while other still in service. Blow that dried air into area where spools are positioned.
Maintain a slightly positive pressure in the AMS so dry air leaks out rather than damp air leaking in.
Have a decent RH% meter between outlet of desiccant chambers and spools to alarm when RH% rises above your desired value for your filaments.
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