The System is a 3D System Viper 2i... something or other... the polymer is Clearvu
Ok I looked at the MTDSS (Material data safety sheet) to find what the actual chemical components are for Clearvue.
Accura ClearVue (SLA) | 3D Systems
4,4'-Isopropylidenedicyclohexanol CAS#: 80-04-6
ChemicalBook---Chemical Products Search
(R)-(-)-Epichlorohydrin CAS#: 51594-55-9
I can't really "See" anything that would directly be affected by differences in relative humidity.
However with any epoxy-ish system IME all of the critical reagents/ accelerators and photo (cationic photo intiators) have to be kept refrigerated...
https://www.radtech.org/proceedings...otoinitiators and their byproducts has been -
IME working with various polymeric systems Epoxies for example become very hygroscopic if the stoichiometry is not right (exact proportions of reagents / accelerators) is not right, sometimes you get "weeping" of polymer and other shorter chain components. All very hygroscopic.
As I understand it the Clearvue is billed as being the most transparent on the market with "Polycarobonate " - like properties ?
I would not expect RH (relative humidity) to affect beam and focus characteristics of the optical train and UV laser etc. to such a significant degree. I assume there's some sort of phase locked loop that keeps everything sharp as it can be (dynamically) ?
I'm wondering if RH might be an indirect corollate (or false correlate) between what you guys may be doing seasonally ? I.e. It's warmer when it's more humid ? Its drier when it's winter - colder depending on where you are. OR vacations and semesters and shelf life of various products ? / use ? What your lab technicians do ?
In a sense if this is not a known problem then literally this becomes a research project.
Devise ways to isolate the problem with various test chambers. (outside of the machine.).
Maybe someone knows the answer to your query but they probably work for 3D systems and they aren't gonna tell you ;-)
Doing independent research may be you only bet.
IME even some of the most stable polymers known to man do not live up to their manufacturer's claims ;-)
Test these things yourself.