Best filament to use in high humidity environment? I'm working on a project to design some custom 3D printed parts for an indoor urban farm where the environment has a very high humidity of above 80%. What would be the best filament to use that will be able to handle this conditions. Are there any coatings that I can use to protect the parts from absorbing moisture?
You don't provide information about the part, but in general PETG, ABS, ABS plus/Pro and ASA are not going to have any issue with humidity for a long time. If it's outdoor, avoid ABS and use PETG or ASA.
What is important is to keep the filament dry BEFORE printing. After printing, no problem. In fact, nylon after printing can be wet on purpose to significantly increase impact strength (and reduce tensile strength).
PLA in high humidity environment may lose some of its strength, but there are PLA parts under the rain which hold perfectly for long time, if they are not loaded significantly.