@RJ_Make_RJ can post the link to the video?
I’ve done this prior, not for UFP protection, which I find.a bit silly, but to keep the print volume temperature more consistent.
Printing in winter time in very cold climates (aka not California) can be a challenge in an old house built in 1928!
@Adomas_Povilianskas
That’s an interesting idea, although I would like to know how much, if any moisture is being produced during the extrusion process, and of what benefit there would be gained in drying during the post extrusion process. Do you suspect an abundance of moisture building up inside during printing? That would be an interesting test nonetheless.
I wounder how hard it would be to pull through silica pellets. I know the gels can be pretty darn small and I would suspect to see a lot of resistance using them.
I’ve focused, right or wrong, in creating a small negative pressure gradient inside the print chamber. Filtering the air out of the printer. This has proven to be somewhat difficult, at least for my FFCP.
Test Video:
Sure, it’s kind of a down and dirty video so go easy on me 
https://www.youtube.com/watch?v=RjgHV2-HvsE
@RJ_Make_RJ very interesting video, the moisture is more of a concern for the filament before it is extruded, I had spools that became unprintable because of moisture, it tends to start breaking and sticking to the extruder. My filament spool is inside the enclosure and I was thinking about keeping the filter inside the chamber. Silica box I have is very porous and rechanrgable. I’ll post a pic on my profile.
Yep those pellets look like a pretty good size, may work just fine, although I believe you would need to use a recirculating system (not a negative) so as not to pull moisture into the envelope. This of course creates a real problem, as you have discovered, in controlling print chamber temperatures.
Ill post an update once I get something made. (in a few weeks probably). Thanks for the ideas and sharing the video.
@Adomas_Povilianskas
Sounds good, maybe we can bang idea’s around. If you use Twitter hit me up RJ_Make
Why not measure the actual humidity and temp over time with an arduino and present the results here?
Of course a control would be needed ‘printing without filament’ to really show the effect if any of the changes made.
Until real data is gathered, this is all subjective.
If you would like to code the arduino, make a schematic to manage like 4 temp sensors and record data to JSON that would be great, I could code a front end display for it in Angular 2 or something like D3D.
At this time i have not had any sudden filament breaks, the filament is not sticking to the extruder. Since the silica beads are turning dark green means that moisture is being absorbed. Therefore an assumption that humidity inside the enclosure is going down is a safe one. I would like to circulate more air though the silica as well to increase the effectiveness.
(your do have a point, it might be as effective as it gets already)
Amongst other benefits a
filtration system would also remove dust and other undesirable particles that can cause a malfunction.
@RJ_Make_RJ I don’t have a Twitter account.