Because that calculator kind of indicated that maybe the bigger effect was the pump air just sweeping the moist air out of the filament drying chamber since heating my current room air to PLA drying temperature of 55C calculates with that calculator to a 4% RH (IIRC). In order to test that before wasting peoples’ time and money if anyone was interested, I bypassed the desiccant column and am just pumping room air into the drying chamber.
But it’s looking like the spool is drying even slower than with the door propped open. The heater isn’t cycling a whole lot so I assume it’s getting to 53C (what I’m drying at) or near where the calculator predicts a 4% RH. I can’t see below 10% RH to know what the column is putting out when in line.
That’s why I say it’s probably all the water in the air at room temperature slowing this dry down. It was to test if it was just sweeping the moist air out that was important or if it was the dry air. What it’s looking like is it’s probably both but don’t know which is bigger. Where I wondered if dry air was important to drying is looking like it’s a key player in the results I’m seeing.