What filament dryer to use?  

RE: What filament dryer to use?

Any suggestion for a filament drying thats cheap to run (ie low power consumption) to be used only for PETG.....

I don't need the higher temperatures needed for more advanced filaments.....I do want it to consume low power though.....

RE:

As a number of people here have commented (myself included), the Sunlu S4 has a 4 reel capacity, a 'maintain humidity' setting (which switches off once the set humidity level is achieved and only switches back on once the humidity rises above another threshold - different to avoid hysteresis) thus saving power whilst the humidity is in an 'acceptable' band.

... and it's currently on offer on amazon (in the UK) ... for the next 10 hrs 🥴

The only downside is the chamber, although it accommodates 4 1Kg spools, doesn't differentiate between the spools (but as you're only printing PETG that shouldn't be a problem)

RE: What filament dryer to use?

I have a creality space pi plus, the dual reel version. I find this works really well due to it being a blown hot air type. This in effect causes the hot dry air to swirl around the outside surface of the reel drying this very quickly, and this is the filament you will be printing with first, as more filament gets used more gets exposed to the hot air and you end up with nice no string prints, the dryer can take two reels so you can pre dry a reel whilst using one, but I have found the occasional wider reel which I sit across the two reel holders.

The only downside I have found is that it is a bit noisy so this can be intrusive, but it doesn't bother me as I sleep in a different room.

10 out of 10 for effectiveness and I gave my Sunlu dryer to my brother.

There is a small and I mean small compartment for silica gel sachets, but I find this is not needed at all.