No - I am referring to a
Dry Box or Cabinet.
For standard PLA or PETG, it is not needed if your print often. If your printer sits idle for weeks or it takes you months to use a spool, you still might find it neccessary.
As I said above in another post, pure PETG and PLA are not the ones you worry about as much. I print a lot of exodic filaments that have carbon fiber, polycabonate, or nylon in them. They can be more senative to moisture in the air. I have rolls of filament that cost north of $100 a KG. You do not want to print a print and waste filament after you find it was too moist. Heck, I have PETG with carbon fiber in it that is $60 a roll. It is worthless until it is dry.
Lastly, you may find a need to dry new spools. I find that about 1 in 6 to 10 rolls arrives wet. Placing it in the dry box for 1-2 days can make it print much better.
I have tested every dry box you can buy and I found that the Camera Boxes work better. There are even several that will let you print from them. I am contimpating ording one for Nylon. If you want a smaller version, I have had good success from the
Eibos Filament dryer. Having a good one can pay for itself if you plan to print exodic filaments.