I dried some PETG in the AMS HT and it was sitting at 5%. I also have an AMS Pro sat along side also with PETG in it and that was dried to 4%. I left the printer sitting for a week and came back to it this morning and the AMS HT is reading 19% while the AMS 2 Pro is still happily showing 4%.
Is the AMS HT not as well sealed as the Pro? I do have the bung in the direct feed hole. Is this just mine or do others have the same problem?
I’m a little disappointed as I bought the HT to handle Nylon and at this rate (weekend use) I’m going to have to dry the filament every time I want to use it or transfer it to a dry box which somewhat defeats the purpose.
Unfortunately it’s not that. I took the roll from the AMS Pro, where it was already dried for several cycles, and have run the dry cycle on the HT several times too. I’m pretty convinced it is simply leaking air. I’ll run an experiment next weekend without a spool in it and see what happens. I was hoping someone would chip in and say ,“mine too” or “mines fine” so I can decide on next step.
All 3 of my AMS HT units are also the same way. AMS 2 PRO’s hold low RH for weeks, AMS HT’s will slowly rise up to 20 within 2-3 days.
Someone conspired that the pro 2 holds lower RH better because of the amount of desiccant it can hold or its proximity to the sensor compared to the HT.
All I know is that the HT is not a solid option for filament storage compared to the pro 2 according to the sensor readings.
I’m thinking about doing a small experiment to see if it’s the valves letting air in when they shouldn’t. Turn the dryer on and let it get a low RH reading, then shut it off and cover the valves with some tape. If the RH still rises then it’s not those.
I wanted to use mine mainly as a dryer, as drying with a mixed load of filament on the AMS 2 Pro is more work since you’ll have to swap things about. Even after drying for 6 hours, it still didn’t hit the sort of numbers the AMS 2 Pro gets down it.
It made me consider that the amount of desiccant we can jam into the AMS 2 Pro might be throwing expectations off when looking at the units back to back.
I haven’t done any exciting test to see how well the drying is working. The roll I dried, I haven’t got to printing yet. So, so far all I’ve got is speculation and wonderment.
I’ve only had my HT for a hand full of days, so just starting to explore this topic. Been seeing the same thing with mine though.
Thank you for confirming yours are the same. I’ll also experiment a bit to see if I can find the cause as well. In the mean time though I guess I will grab another AMS2 and consign the HT to dryer only duties. Though I have found that running the HT as a dryer while printing TPU through the hole in the back gives me improved feed and print quality