Linux

I just have a simple Brother laser printer: It has never failed me. Not even sure what model it is but I imagine their scanners/MFPs are pretty similar.

Another voice for the Brother laser printer, a truly dependable workhorse.

Anything Brother.

I've had fantastic luck with a Brother MFC b&w laser. Aftermarket toner cartridges are $20 and last a ridiculously long time. The wifi is jank so I'd recommend keeping it connected to your computer via USB, but I was able to get it running on a CUPS server via a Pi easily enough, and brother does make Linux drivers available.

BROTHER LASER PRINTER with a scanner combo. Literally don't bother with anything else.

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Brother works incredibly well. Plug and play

I got two Brother laser AIOs (MFC1910W) for my folks and myself.
All I had to do on Arch was install brother-mfc-1910w for printing, brscan4 for scanning and oh-brother for (occasionally) upgrading the firmware, all over WiFi.
I think more user-friendly distros come with these packages preinstalled, so it should just be a matter of opening the printer manager and waiting for it to show up.
Don't think they make the specific model anymore, but any Brother laser AIO should do.

All-time classic Verge article on this subject:

https://www.theverge.com/23642073/best-printer-2023-brother-laser-wi-fi-its-fine

Get a Brother laser aio.

My Brother HL 230 laser printer is so reliable. Had it for years and it never failed me.

As others have said, Brother laser printers are great. I've had mine for ~10 years, it works better on Linux than it does on Windows, and the toner cartridges last an absurdly long time. I don't print heavily but I think I'm only on my third toner cartridge since I bought the thing.

I recently ordered a Brother printer, and it just works. "Brother MFCL3730CDNRF1" At one point it was a bit tricky to add it to Cups, but after it, it worked flawless.

A Brother laser. If buying today, I would get a document feeder, duplexing, and wireless. The $150ish version is fine for home use. Mine lacks wireless so we use special software to add it that adds a step. But it just works and only needs a new toner ever couple years at our printing pace.

Brother laser AIO, Just works, and if you don't really print that much, the starter toner feels like it'll last forever.

Brother laser printer. They are oaks.

I like my Ender3 V2.

If you want a simple colour printer and scanner, go for a Canon Megatank or Epson Ecotank. If you're only printing black and white, a Brother laser printer is good, just a touch more expensive than other equivalents. The OEM toner isn't cheap, in theory tho, they can last much longer without needing to print. The ink tank printers have far cheaper ink. Only downside is that it requires printing once a week to ensure that nothing clogs up. That said, these tank printers are smaller and lighter than Brother Colour AIO's.

Look for PCL6 support.

You won't even need a driver, because it already speaks a standard protocol.

I've used a Brother business AIO Inkjet for some years without any problems.

I'm happy with my Epson ET-2820. It is a wireless inkjet printer, but it uses ink from bottles what is not that expensive. The printer hasn't dried up, yet.

The device works with the generic CUPS "driverless" printer driver, so no configuration on Linux computers to print. Scanning worked out of the box, too with sane.

tl;dr: most flawless working printer I ever owned.

Fortunately for me, both my printer and scanner have worked flawlessly with Linux from day one (notwithstanding some CUPS shenanigans where it had problems finding USB printers, but that has nothing to do with the printer). Unfortunately for you, that means they are both fairly old already and probably not available as those specific models anymore.

My scanner is a Canon Canoscan LiDE 220. It's a fairly small model with a scan area just barely bigger than an A4 page. That suits me fine as someone who rarely actually scans stuff, as I can just stash it somewhere when I don't need it and pull it out when I do.

My printer is a Brother HL5340DL. It's about as big as you would expect for a personal laser printer (so not exactly handy anymore, but most people should be able to make it fit). It's ten years old now, cost somewhere around a hundred Euros when new, survived two moves and still works flawlessly, including the duplex function. When setting it up in CUPS, I found the generic PCL drivers to work much better than the Brother-specific ones. Just as a hint for others.

When looking for a scanner, check the SANE database: http://www.sane-project.org/sane-mfgs.html

Edit: I forgot something, my scanner does not work "flawlessly" after all: If I scan at low or medium resolutions, the scan results get messed up. It looks like the scanner software gets confused about how long exactly each scan line is supposed to be and puts the line breaks in the wrong places. That's probably a bug in sane-backends, but I have never followed up on that one, because my workaround is simple and works fine for me: Just scan at 1200 dpi and then downscale stuff. Still a bug though, and saying the scanner works flawlessly would be wrong.

I am happy with my Epson consumer device, it works out of the box.

Personally I'd keep them separate unless space is an issue.

For a scanner I like my Cannon LiDE 110 It just works with simplescan. For printers, any laser that supports PCL or Postscript should be fine. I'd recommend Lexmark or Brother. For black-only, I like my Lexmark B3340. I have a couple of older HP color lasers but honestly don't really use them except for printing trail maps every now and then. For color pictures (and the maps) I now use a Canon Selphy CP1300.

HP is a awful company with a well deserved terrible reputation, but their linux support is great. I have a combo printer/scanner that works without a single issue.

All you gotta do is install..hplip i think it is? and plug the printer in.

Our Samsung color laser AIO was getting flaky, especially for net access. I replaced it with an Epson EcoTank AIO and it's been absolutely hassle-free.

I was apprehensive at first, because using inkjet printers back in the 90s was just painful. But so far, never had clogging and hardly ever had a paper jam. I'd say the running costs are comparable or lower than laser.

Color laser printers always run out of yellow because they inline a yellow fingerprint. AFAIK this isn't the case with inkjets. So savings and additional privacy there.

@Cinnamon3431
Brother MFC machines are what I've always used without issue in linux. Brother offers linux drivers for both print and scan on their site and they're fairly simple to install.
@linux

I know this isn't what you asked but just have the documents sent to you electronically and cut out the middleman while saving some trees! You can also send them electronically if required. Paper is so 1980's.

I've had my MX490 for 2 years and i think it works pretty well. Generally speaking, the CUPS setup is far easier with Airprint printers so if you're interested in that I'd pick up a printer that supports AirPrint. Arch wiki has more info on set up it needed