Anything by Spectrum, but especially their Caribbean blue PLA.

Never had any issues with Hatchbox, it's my favorite PLA. I'll use Overture if I want something cheaper that works. Prusament if I want to spend an arm and a leg for shipping. I usually only order Prusament if I need something else from Prusa.

For PLA, any brand that has the blue you seek. PLA is not that complicated.

Late to the game,but imho best navy blue is black forest Filaments Navy Blue - but of course these are hard to get outside of Europe.

Inland, the microcenter house brand, is surprisingly good for the price point and comes in basically every color imaginable.

Polymaker is also very good with lots of colors. They used to be very expensive but the price is competitive today.

@terabyterex poly maker pla is my go to.

The ones I've come to really like for their consistent quality results are:

• Prusament (PETG)
• Fiberlogy (ASA) <-- I'm sure i have a navy blue spool from them in my print room. I'd double check, but it's way past my bed time
• eSun (ABS)
• Addnorth (Various)

Prusament. Stopped getting anything else, unless I need something super specific that they don't have

Don't have a lot of choices here in NZ, esun is a decent quality cheap option we can get in store. Otherwise it's Bambu which can be variable, some print great and some are a nightmare. Or a limited selection of prusament at a big markup over buying it directly

• Prusament: always top quality, at a price (PLA, PETG and ASA)
• dasfilament.de: I bought a few spools and it has been good so far (PLA and PETG)

Edit: forgot to mention Colorfabb, I used a lot of their Economy PETG, it's fine in terms of quality, not as good as Prusament. Nowadays the price isn't that good compared to competition.

Before my last printer died 5 years ago, I was getting good results with Hatchbox filament. Not sure about their current state, but they were the most reliable I had found at that time. Looks like they currently have one I would call navy blue.

My new printer is supposed to arrive today, so I'll be going through the filament evaluation grind again soon.

I tend to stick Elegoo PLA/PLA+ and that usually works well for me - their dark blue looks fantastic IMO. Overture's PLA seems to print well too, so did the roll of eSun I got.

Just avoid Creality Ender PLA at all costs. That stuff was awful!

I pretty much only use prusament. Literally today I bought some overture for the first time. Read a bunch of posts and decided to give it a try.

I use PolyTerra Army Blue for all my Navy Blue needs. Technically it's a matte filament but I honestly can't tell.

Edit: PolyTerra (made by Polymaker) is now called "Panchroma matte" for some terrible reason