Does anyone know how you best preserve your filaments?
where can I buy zipbag and which sizes are best?
I am using vacuum bags like the food saver setup but with a portable hand unit.
Package them in a plastic bag with a packet of desiccant, doesn’t matter the size, just get a vacuum and suck all the air out of the package.
okay but where do you buy this ?
Vacuum bags are great for it.
You can just Google it and find them. They are super common for vacuum sealing clothing and some of the smaller sizes could be used for normal spools or larger ones for multiple spools
Gallon size Ziploc bags should be fine. If you’re going to be storing filament for over a month you may want to use a vaccum bag.
Yeah @Adam_Steinmark holds a good point. I have four spools sitting on my shelf right now without any vacuum bags or anything only because I know they will probably be used up within a couple weeks. Otherwise I would seal them. I have a box I put my spools in otherwise, but the bags are a much better option.
Gallon (6l bag) Zip bags with Silicagel bones , do by me the trick.
What are the symptoms of a filament badly preserve?
Gallon bags min 6liter , badly filament is brittle and not smooth printing.
Gallon bags min 6liter , badly filament is
and not smooth printing
@Maxime_Gagne the filament will absorb water and you’ll hear bubbles popping when printing. This can cause clogs but in most well tuned hotends you shouldn’t have problems unless the filament has absorbed extensive moisture. Nylon has a tendency to do this so it’s important you keep nylon vacuum sealed with desiccant. Unfortunately my nylon shipped with the vacuum bag torn 
I recommend that you keep it in a dry place. I live in Georgia which is crazy humid a good bit of the year, so I leave mine down in the basement where I keep it cold and dry all year around.
Desiccant silica gel can be bought in big bags as silica cat sand. You can fill a sock tie a knot in it and it should work. If it gets moist you can dry it in a microwave oven. I keep filament in plastic containers. But I’m lucky Johannesburg South Africa is bone dry in winter and humidity is not a huge problem. Even so if I leave filament out it goes hard and brittle.