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Reverse engineering my Coway air purifier to ditch the cloud

https://scottjg.com/posts/2026-11-11-reverse-engineering-my-coway-air-purifier-to-ditch-the-cloud/
354•scottjg•19h ago•92 comments

"LibreOffice works 365 days a year. Just saying."

https://twitter.com/LibreOffice/status/2121205272479998268
58•mksaunders2•18m ago•3 comments

A technical vision for the Haskell ecosystem

https://discourse.haskell.org/t/a-technical-vision-for-the-haskell-ecosystem/15078
73•cosmic_quanta•2h ago•28 comments

Why Zig over C for Systems Programming

https://www.mtsoukalos.eu/2026/11/why-zig-over-c-for-systems-programming/
151•torutofu•3h ago•99 comments

Jensen Huang resigns

https://apnews.com/article/nvidia-megaspeed-china-singapore-huang-5403f152a601cf82ce939f1d24fffa0f
3899•lldb•1d ago•3341 comments

Doomsday: Friday, 13 November, A.D. 2026 (1960)

https://www.science.org/doi/10.1126/science.132.3436.1291
332•voxleone•5h ago•233 comments

Lonewolf 0.3 – A standalone XMPP server written in Rust

https://github.com/lonewolf-im/lonewolf/releases/tag/v0.3.0
52•ortuman•3h ago•9 comments

Brazil's Caixa insurer breach exposes names and tax IDs of all 7.6M customers

https://filemanager-cdn.mziq.com/published/3972906b-e50b-4f74-ab74-4d0d32125d11/9567a559-d20a-486...
104•dvaplima•1h ago•26 comments

Palmfrets, Minnesota guitarist's invention, strikes a new chord

https://www.echopress.com/business/minnesota-guitarists-invention-strikes-a-new-chord
32•bookofjoe•2h ago•27 comments

IceWM

https://ice-wm.org/
319•inatreecrown2•12h ago•177 comments

Elevated errors on claude.ai, Claude Code, and platform.claude.com

https://status.claude.com/incidents/nn11wk485zfn
432•__vivek•7h ago•352 comments

Rust 1.100

https://blog.rust-lang.org/2026/11/12/Rust-1.100.0/
831•mbStavola•22h ago•300 comments

EU Digital Identity Wallet rollout: every EU state on one board

https://myid.ie/business/eu-digital-wallet-tracker/
70•mooreds•2h ago•30 comments

Brave Search API now accepts agentic payments via the x402 protocol

https://brave.com/blog/search-api-agentic-payments/
219•sjdh76•14h ago•125 comments

Switcher (2004)

https://folklore.org/Switcher.html
132•sammatilda•14h ago•39 comments

Jonathan Blow – If AI Solved Coding, Why Is My Software Still the Same? [video]

https://www.youtube.com/watch?v=IRK8h67ol7Q
86•helloplanets•2h ago•39 comments

Show HN: My $300 embroidery machine needed a subscription, so I built my own app

https://github.com/simpsoka/zigzag
679•simpsoka•1d ago•222 comments

AI Is Destroying the Trust Between Writers and Readers

https://www.theatlantic.com/books/2026/11/ai-literary-scams-amazon/689391/
191•FinnLobsien•6h ago•85 comments

Gemini 4 Hydrogen and Orchestrator

https://antigravity.google/blog/gemini-4-hydrogen-in-google-antigravity/
480•jonbaer•22h ago•158 comments

Former Nvidia CEO Huang had a relationship with a second employee, sources say

https://www.reuters.com/technology/former-nvidia-ceo-huang-had-relationship-with-second-employee-...
406•jbredeche•21h ago•436 comments

Why is Google cutting off Search from AI-free schools? Here are some theories

https://text.npr.org/nx-s1-6029408
64•kamaraju•1h ago•47 comments

Dwarf planet candidate appears which takes roughly 280 years to orbit our sun

https://www.smithsonianmag.com/smart-news/astronomers-found-a-mysterious-object-orbiting-far-beyo...
372•cybermango•22h ago•160 comments

Arm boss Rene Haas approached in Nvidia CEO search

https://www.ft.com/content/2a64f698-46dd-4178-a3f4-4c5f4c0a0926
7•bazzmt•18m ago•3 comments

Edge0-145B: Frontier AI Capabilities on Your Own Computer

https://edge0.ai/blog/introducing-edge0-145b-frontier-ai-capabilities-on-your-own-computer
315•sroussey•18h ago•94 comments

US test reactor cleared for operations

https://www.world-nuclear-news.org/articles/us-test-reactor-cleared-for-operations
51•PaulHoule•3h ago•16 comments

North Korean hackers used fake video calls in $400M crypto hack, says FBI

https://www.bbc.com/news/articles/cqdj1ellpd70o
11•saikiran91•38m ago•0 comments

I'm making LLMs work on small and old devices

https://github.com/hyperionaidev/smolmaxxing/
450•mrashad74•1d ago•171 comments

Service degradation on Microsoft 365

https://status.cloud.microsoft/
1105•dkpk•23h ago•937 comments

U.S. October PPI Rises 6.5% YoY, Highest in Nearly Four Years

143•moonypto•2h ago•123 comments

The 42-Year Journey to Bring 'Neuromancer' to the Screen

https://www.wired.com/story/exclusive-apple-tv-neuromancer-creator-interviews/
83•Brajeshwar•3h ago•58 comments
Open in hackernews

Writing your own CUPS printer driver in 100 lines of Python (2018)

https://behind.pretix.eu/2018/01/20/cups-driver/
203•todsacerdoti•1y ago

Comments

roywashere•1y ago
Pretix is a very interesting piece of open source software for selling event tickets. It’s nice to see them venturing out to writing printer drivers for ticket printers! All the best for them.
behnamoh•1y ago
https://gimp-print.sourceforge.io/ which uses CUPS helped me resurrect an old Canon printer for which the company refused to provide updated drivers on macOS.

I was about to throw it in the recycling/trash, but I just couldn't accept that a perfectly fine hardware was crippled because the software was not updated to work on the latest macOS versions. Perplexity pointed me to Gutenprint and it worked wonderfully! The only thing that doesn't work is the scanner functionality.

asveikau•1y ago
Many years ago I remember Windows support vanished on a bunch of printers at the 32 to 64 bit transition. That was around the time I learned how printing on Linux and BSD worked, to save a printer or two.
fsckboy•1y ago
>support vanished on a bunch of printers at the 32 to 64 bit transition

that was after the win16 to win32 transition when every single cutting edge tech Sony product I owned, many of them quite expensive (and designed for win98/winME because that was cutting edge), stopped working. I've never bought anything Sony since, and no regrets.

Some time later, Sony Pictures wanted something from me and I said, "I boycott Sony" and they said "we're a different company" and I said "change your trademark then, that's the whole point of trademark, reputation"

sherr•1y ago
It was the rootkit on a CDROM that did it for me. Ever since then, I avoid Sony. As you say: reputation.
LargoLasskhyfv•1y ago
Did you try http://sane-project.org for the scanner part? They have support for some Canons, maybe you're lucky?
exhilaration•1y ago
I bought VueScan in 2014 specifically for a Canon scanner, looks like it's still around: https://www.hamrick.com/
saltcured•1y ago
This takes me waaaaaaaay back to when I did my first bit of practical low-level programming. I wrote a little C program that translated PNM bitmaps into the wire format for my dusty 24-pin Epson dot matrix printer. I don't remember the details, but I used it with some plugin system involving Ghostview to print postscript documents from my first Linux system in the early 90s.
whycome•1y ago
Is there an LLM specifically for this use case scenario?
a-ungurianu•1y ago
I’m not clear what you’re asking with this question.

Do you mean a LLM to write printer drivers? For that I think any of the coding LLMs should be able to help

Or do you mean using an LLM to do the raster -> FGL format translation? While I’m sure it might be possible, feels like an awful waste of resources, and when it comes to printers, you kinda want the guarantee that what comes out is the same that comes in.

whycome•1y ago
I was wondering about “domain specific LLM” for printer drivers.
userbinator•1y ago
However, the license of the BOCA driver forbids using their driver to control printers of other vendors.

Since this is a printer, I interpret those the same way as "you're not allowed to use third-party ink": I don't care.

ale42•1y ago
Personally, I don't either. But if you're a business, you probably need to care even if you don't want to.
userbinator•1y ago
Enforceability of EULAs has always been a rather open-ended question.
carlos22•1y ago
Especially in non common law countries like Germany or France. Not sure about drivers and other vendors but 3rd party ink or even patches to counters, hw modifications to "repair" (better to remove the planned obsolescence) are legal.
ValdikSS•1y ago
Oh!

Take a look at EPSON printer driver, which prohibits you from:

1. Sharing the printer you own with anyone else unless they agree to the license of the driver (incl. business setup)

2. Sharing the printer over the internet unconditionally, because this allows to use the driver for people who did not agree to the license

3. Incorporating the driver in any "revenue generating product or service"

https://download.ebz.epson.net/la/linux/inkjet_for_linux.htm...

1. Grant of License.

[…] provided that the Software is used (i) only in a single location (e.g., a home or office or place of business), or in the case of a mobile device, on a Device owned or otherwise controlled by you, and (ii) only in connection with Epson Hardware owned by you. You may allow other users of the Epson Hardware connected to your network to use the Software, provided that you shall ensure that such users use the Software only in accordance with this Agreement. You agree to be responsible for and indemnify Epson for liabilities incurred as a consequence of use by such users.

3. Other Rights and Limitations.

[…] Further, you agree not to place the Software onto or into a shared environment accessible via a public network such as the Internet or otherwise accessible by others outside the single location referred to in Section 1 above.

You may not rent, lease, distribute, lend the Software to third parties or incorporate the Software into a revenue generating product or service.

ValdikSS•1y ago
>Unfortunately, CUPS sends us grayscale values and our printer only supports pixels that are either fully black or white. Since we do not want to drop grayscale values compeltely, we want to apply Dither.

CUPS can send black-and-white 1 bit data, dithered. It's just a matter of proper option in a PPD file. It could also handle rotation by itself.

Other than that, pretty good and accurate article! I bet you can write the driver (filter) even in <50 lines of Python code :P

dale_huevo•1y ago
This is great.

Until now I thought CUPS drivers had to be written in C in order to link against its internal APIs.

Most inexpensive Chinese thermal printers ship with blatantly GPL violating drivers and they are precompiled binaries. Which means half the time they won't work in your situation, assuming you trust their probable malware in the first place.

Havoc•1y ago
Ideally don't buy a thermal printer at all. The paper usually contains BPA. You found one that says BPA free? Yep they switched to BPS. Also toxic and harmful to reproductive health.

If you absolutely must - use a European supplier - both are banned there for thermal paper.

zrobotics•1y ago
I was about to write an incredulous comment accusing you of licking receipts, but I thought I'd look into it first. It does appear that just handling thermal paper can expose you to BPA [0].

Such a shame, thermal printers are the only printing device I don't suspect of being a plot by Satan to tempt us into wrathful thinking. Thermal printers are insanely reliable, I've worked IT for several businesses with shipping departments and thermal label printers are less troublesome than even keyboards, I struggle to think of a class of equipment that generated less issues. I guess I should have suspected there was something devious about them, they are printers after all and all other printers I've had to support have always just been constant sources of annoying issues.

[0] https://www.pca.state.mn.us/business-with-us/bpa-and-bps-in-...

dqv•1y ago
That article has a good alternative though: ascorbic acid. I think the last time I looked into this I had a hard time finding thermal labels that used ascorbic acid, but they at least have receipt paper. I do still have concerns that even the ascorbic acid paper still has something bad in it absent any documentation going over the full ingredient list.
devmor•1y ago
I had the same incredulity when BPA alarms started going off, thinking it was another Prop 65 warning type thing. Finding out that it is literally absorbed through the skin sent shivers down my spine. That stuff is scary.
th0ma5•1y ago
CUPS was instrumental in me getting an old Commodore 64 printer working haha. It can do some amazing stuff.
_rami_•1y ago
Author here. Funny this ended up here again!

These days, we don't use this any more. First, because we now use primarily original Boca printers and are allowed to use the official drivers, and second, because we do 99% of printing from Android devices, where we also handle the protocol conversion ourselves, but it's a lot simpler without CUPS. Still, was a fun ride doing this back then!

ivolimmen•1y ago
I currently own 7 printers. 6 I got from a small business owner who wanted them gone. He asked me to check them and give them away to others who needs them. Maybe I just just grab one and hook it to the internet and let others print stuff. Would be a nice social experiment and a big middle finger to the manufacturer and those stupid EULA's.
CableNinja•1y ago
Youd want some sort of filter and ocr in between to prevent things that were prevalent in the days of faxes. All black pages, endless printing, etc. And ofc youd want some csam filter because you dont want to end up having printed that. Gl proving it wasnt you.

That being said, it would be an interesting thing to see what people would decide to send to a random printer on the internet

0_____0•1y ago
Oh man... I've definitely crumpled up and put a receipt in my mouth before... probably even eaten one at some point, probably to horrify a girlfriend in my younger days. I know, I'm a gremlin.
Havoc•1y ago
Yeah knowledge of it seems pretty thin on the ground despite this being decade+ known. Haven't quite worked out why - unlikely say tobacco it doesn't seem like an industry that would have financial might behind it.
_rami_•1y ago
There's completely safe thermal paper in Germany by this company: https://www.oekobon.de/ There's a similar company in France, I forgot the name
kiliankoe•1y ago
I use these for printing my shopping lists, I like synced lists (in Todoist in my case), but hate walking through stores with a device in my hand. The Ökobons have the added benefit of me being able to scratch items off the list with my fingernail. Also the blue is cool.