ROLLER

@Krauerking yeah, yuck. The two point with Calcium chloride gives this insight. It has Relative humidity of around 33. If the offsets are constant then they may be worth using, with the ick factor of course. If the offsets don’t make sense then the detectors are shot and fit for the bin.
You can get calcium chloride at the hardware store, it’s used as Desiccant for damp areas.

@Krauerking ah but you can measure the offset. A two point calibration should cover your measurement range. Not ideal but you could get a reading.

@Krauerking you could look at calibrating the hygrometers or at least the offset.
https://www.stevejenkins.com/blog/2014/06/how-to-calibrate-a-hygrometer-humidity-sensor-using-the-salt-test/
Two point calibration with calcium chloride and sodium chloride might be even more accurate

@Krauerking @PlasticExistence they’ll have subtly different drying profiles. Silica gel had a higher capacity but will maintain a generally higher relative humidity. Check the graph here out https://www.impakcorporation.com/desiccants
Activated alumina doesn’t appear to be as effective as molecular sieve at low humidity from a lit. search.

You should check for air leaks in the system first. When I lose Desiccant this is usually why.

P. S. Silica gel can be regenerated.

@slug @Krauerking there are some out there. Can’t say I looked to closely but I wasn’t terribly impressed.

@Krauerking my opinion is no. For many things you can find a model on line. Much of the challenge can be getting the printer to work as you wish, so modelling might not be first on the to do list.

@bdonvr you’ve probably heard this before… But magnetic PEI build plate is the best adhesion I’ve had.
Used glass on my CR10S but it’s night and day vs PEI on the ender 3 S1 plus.
Keeping it clean is key but copious quantity of IPA and a very light sand has worked so far.