Dear BambuLab Team,
I would like to ask you for the following features:
There are loads of projects for barrels on Makerworld as containers for desicant to dry in AMS HT. It would be perfect to add a special function for that. Content of the function would be heat up to 85° and turning the barrel slowly and continously to ensure a uniform drying result. Thank you.
firmware-feature
Just turn on Nylon/PA at 85c and rotate during drying option. Why do you need a special mode for desiccant? 
I bought an AMS HT specifically to dry desiccant. Over the last few months I have been using a spool shaped rack that holds desiccant packets. I set the temperature to 85 degrees and select rotate.
Any images to share?
Keep in mind that a lot of desiccants require 120C to release moisture effectively.
To my knowledge there is only a limited amount of desiccants that do this at 85C.
Additionally, I wouldn’t want to have that type in my AMS-HT to dry filaments. It would probably moisten the filament.
Because it only turns from time to time. A slow, constantly turning mode would be perfect. It probably would be super easy to integrate…
Normally for a desiccant, you can find drying curves → water loss over time for specific temperatures. At 85°, perhaps there will remain perhaps 2 or 3% more water in the desiccant and it will take more time. But in an office environment, you do not always have the space / possibility for an oven…
The idea was to or dry filament or dry desiccant - agreed, both at the same time would probably not make to much sense…
Still, how can desiccant that expels water at 85C, also absorb water at the same temperature?
In other words, how can it dry filament at 85C when at that temperature it releases moisture?
A microwave is also a good method to dry desiccant, and also a lot faster. But of course that requires space also.
Stefan of CNC kitchen did some good testing on the matter.
Don’t use desiccant bags unless you do this! - YouTube
You seem to be misunderstanding the process. The desiccant is recharged in the AMS-HT and then used in dry boxes and other AMS units to help prevent filament from gaining moisture there. If the desiccant is drier than the filament, in an enclosed container, at room temperature, the filament will give up its moisture which the desiccant will then absorb. Likewise, if the desiccant is saturated, it has the potential to give up some of its moisture to the filament. Leave them in a sealed container long enough and they will reach an equilibrium where each is absorbing and losing moisture at the same rate.
Thus, to keep one’s filament dry, a regular rotation of recharged desiccant in dry boxes and AMS units is perhaps the best method. It takes far less energy to keep one’s filament dry rather than to repeatedly dry it.
By the way, I began using filament dryers to recharge my desiccant because ever so often a desiccant bead would explode in the microwave or burn in the oven, and there arose household concerns over the possible toxicity of recharging desiccant in the microwave or oven. The AMS HT seems like such a perfect device for recharging desiccant. It conveniently sits between my other AMS units and flows rather nicely with my printing process.
Welcome to the world of equilibrium! What is actually happening is at any temperature (almost), some water is leaving the surface while other water is arriving. At equilibrium those processes happen at the same rate and there is no net change. But if you could see the water molecules hitting and sticking or jumping off the surface you would see there’s actually a lot going on.
Heat something with high water content in a dry environment and you skew the equilibrium to where water leaves at a higher rate than it arrives and the net effect is drying.
Put something with low water content in a wet environment and the new movement is to add water to that something.
All that happens when you heat or cool and put things in high or low humidity environments is the equilibrium shifts.
Additionally, it is all about relative humidity. When you heat up a gas filled environment, gas at a higher temperature is able to absorb more moisture and its relative humidity decreases…so for sure it would be better to be able to heat up to higher temperatures. But at 85°C you can get a significant part of its moisture in loaded condition out of the desiccant.