It’s a tough call, but if you HAVE to leave something exposed I’d probably choose the HIPS. I’ve had less trouble with it than others when it comes to moisture. But I really recommend keeping it ALL in sealed containers with desiccant if at all possible. Moisture just causes too many problems with print quality.
I started with 5gal buckets and the screw-on Gamma lids, adding (2) of these desiccant packs in each bucket:
http://www.ebay.com/itm/151578925330?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
I didn’t like that solution for a couple reasons:
(1) Each bucket and lid combo was about $12, and two desiccant packs were $7.50. That’s $19.50 per bucket, and each bucket generally held only 4 spools, so that was $4.88 per spool for storage.
(2) I couldn’t see the filament spools through the buckets.
I later switched to the “Ziploc 44qt Weathershield Box” (upc 762016448824):
(1) Cost is about $16 each. Add two desiccant packs ($7.50) and you have $23.50 total for each box. But each box can hold (10) standard spools, so that’s $2.30 per spool for storage.
(2) You can see through them!
There is also a 60qt version of the Ziploc Weathershield Box that brings the cost-per-spool down a bit more, but I found them to be a little too big to handle and stuck with the 44qt model. YMMV.
Some photos are attached. I added some elastic cord at the top to hold the desiccant packs, but you can just throw them in the bottom (they fit between the spools).
