frontpage.
newsnewestaskshowjobs

Made with ♥ by @iamnishanth

Open Source @Github

fp.

The Swift SDK for Android

https://www.swift.org/blog/nightly-swift-sdk-for-android/
401•gok•8h ago•155 comments

Unlocking Free WiFi on British Airways

https://www.saxrag.com/tech/reversing/2025/06/01/BAWiFi.html
92•vinhnx•13h ago•12 comments

People with blindness can read again after retinal implant

https://go.nature.com/48JVwrv
30•8bitsrule•3d ago•5 comments

Valetudo: Cloud replacement for vacuum robots enabling local-only operation

https://valetudo.cloud/
191•freetonik•4d ago•48 comments

What Is Intelligence?

https://mitpress.mit.edu/9780262049955/what-is-intelligence/
35•sva_•3h ago•24 comments

First shape found that can't pass through itself

https://www.quantamagazine.org/first-shape-found-that-cant-pass-through-itself-20251024/
284•fleahunter•14h ago•64 comments

Context engineering is sleeping on the humble hyperlink

https://mbleigh.dev/posts/context-engineering-with-links/
37•mbleigh•1d ago•8 comments

I invited strangers to message me through a receipt printer

https://aschmelyun.com/blog/i-invited-strangers-to-message-me-through-a-receipt-printer/
186•chrisdemarco•5d ago•69 comments

Harnessing America's Heat Pump Moment

https://www.heatpumped.org/p/harnessing-america-s-heat-pump-moment
106•ssuds•8h ago•231 comments

Deepagent: A powerful desktop AI assistant

https://deepagent.abacus.ai
13•o999•2h ago•1 comments

Advice for New Principal Tech ICs (I.e., Notes to Myself)

https://eugeneyan.com/writing/principal/
11•7d7n•2h ago•1 comments

How to make a Smith chart

https://www.johndcook.com/blog/2025/10/23/smith-chart/
112•tzury•11h ago•20 comments

Study: MRI contrast agent causes harmful metal buildup in some patients

https://www.ormanager.com/briefs/study-mri-contrast-agent-causes-harmful-metal-buildup-in-some-pa...
111•nikolay•7h ago•80 comments

Code Like a Surgeon

https://www.geoffreylitt.com/2025/10/24/code-like-a-surgeon
118•simonw•13h ago•70 comments

Public Montessori programs strengthen learning outcomes at lower costs: study

https://phys.org/news/2025-10-national-montessori-early-outcomes-sharply.html
265•strict9•2d ago•141 comments

Twake Drive – An open-source alternative to Google Drive

https://github.com/linagora/twake-drive
311•javatuts•18h ago•178 comments

Modern Perfect Hashing

https://blog.sesse.net/blog/tech/2025-10-23-21-23_modern_perfect_hashing.html
80•bariumbitmap•1d ago•9 comments

The fix wasn't easy, or C precedence bites

https://boston.conman.org/2025/10/20.1
5•ingve•2d ago•0 comments

Why formalize mathematics – more than catching errors

https://rkirov.github.io/posts/why_lean/
165•birdculture•5d ago•61 comments

Conductor (YC S24) Is Hiring a Founding Engineer in San Francisco

https://www.ycombinator.com/companies/conductor/jobs/MYjJzBV-founding-engineer
1•Charlieholtz•7h ago

Carmack on Operating Systems (1997)

https://rmitz.org/carmack.on.operating.systems.html
65•bigyabai•3h ago•39 comments

Mesh2Motion – Open-source web application to animate 3D models

https://mesh2motion.org/
186•Splizard•17h ago•34 comments

Underdetermined Weaving with Machines (2021) [video]

https://www.youtube.com/watch?v=on_sK8KoObo
8•akkartik•2h ago•3 comments

Why can't transformers learn multiplication?

https://arxiv.org/abs/2510.00184
126•PaulHoule•3d ago•69 comments

Debian Technical Committee overrides systemd change

https://lwn.net/Articles/1041316/
170•birdculture•18h ago•172 comments

New OSM file format: 30% smaller than PBF, 5x faster to import

https://community.openstreetmap.org/t/new-osm-file-format-30-smaller-than-pbf-5x-faster-to-import...
84•raybb•6h ago•8 comments

Typst 0.14

https://typst.app/blog/2025/typst-0.14/
549•optionalsquid•16h ago•146 comments

Interstellar Mission to a Black Hole

https://www.centauri-dreams.org/2025/10/23/interstellar-mission-to-a-black-hole/
131•JPLeRouzic•19h ago•95 comments

TextEdit and the relief of simple software

https://www.newyorker.com/culture/infinite-scroll/textedit-and-the-relief-of-simple-software
79•gaws•8h ago•84 comments

'Attention is all you need' coauthor says he's 'sick' of transformers

https://venturebeat.com/ai/sakana-ais-cto-says-hes-absolutely-sick-of-transformers-the-tech-that-...
360•achow•23h ago•184 comments
Open in hackernews

I invited strangers to message me through a receipt printer

https://aschmelyun.com/blog/i-invited-strangers-to-message-me-through-a-receipt-printer/
186•chrisdemarco•5d ago

Comments

ge96•8h ago
I wonder if you can see what was sent by others
aschmelyun•6h ago
They’re being stored redundantly on a sqlite db. I’ll think about adding some kind of feed to the page if others are interested.

I don’t know, I kind of like having a place for some people to anonymously vent (as more than a few have).

xandrius•6h ago
I'd love to see others!
toomuchtodo•5h ago
Consider a checkbox whether to be anonymous, which you can filter the feed with.
bstsb•8h ago
saw this project on TikTok when it went viral, love both the concept and implementation. the creator could easily overengineer something simple like this, but looks like the Pi stands up well with high load.

the only problem i had with the site itself was actually accessing it - TikTok doesn't "do" links so i kept having to check if i'd spelt their name right!

ben-gy•8h ago
That’s awesome - I did a similar thing recently by replacing my sticky notes with receipts - https://github.com/ben-gy/thermalnotes
toomuchtodo•8h ago
I love all of the HN receipt printer posts, keep them coming please. There is something delightful in this analog experience.

https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

(if you build yourself, source non-phenol [made without BPA/BPS] thermal paper rolls)

MomsAVoxell•8h ago
Yes, the use case of receipt printers is really intriguing .. (https://news.ycombinator.com/item?id=45698598) .. I find myself wondering what other simple micro-printing things might be worth the effort. The offline nature, the anonymity of the reader - this makes it an appealing media, suddenly, in the storm of digital life.

In my case, I will probably try to use my receipt printer as a zine production line. The nature of the format inspires some great article writing ..

toomuchtodo•8h ago
Something to note is the impermanence of the final product, as thermal paper does not have longevity (only ~1 year). I have not found a similar solution (printer + media with a similar form factor) where the print lasts longer, so open to suggestions for such use cases. I suppose in the short term, including a QR code in the print job that links to a perma/deep link online might work from a publishing perspective for bookmarking purposes.
derwiki•5h ago
I really have fallen for impermanent art. I display slide/color positive film on my windows. Yup they will fade and that’s totally ok.
b0rbb•8h ago
There was a REALLY cool project by the design firm Berg in the UK about ~13 years ago. Cute little thermal printer with online services that allowed you to have scheduled printouts of things like weather reports, horoscopes, etc.

And... oh my goodness, I was looking for pictures of it and it turns out some kind person decided to put work in on having a way to do onprem services for it! [Check it out here](https://nordprojects.co/projects/littleprinters/)

aosaigh•7h ago
I remember wanting the Berg printer but it was crazy expensive
dylan604•4h ago
I know someone that this would be perfect for, but sadly too niche to have survived. It's a neat idea being able to get little "tickets" for various daily tasks for those that do better with those types of things compared to using a digital calendar
wackget•2h ago
> The team at Berg invested a lot of time developing the visual language and aesthetics of Little Printer, across the physical device and their web service.

Shame they didn't bother to invest any time in making sure their expensive devices wouldn't end up as paperweights. Seriously, it's infuriating that they were lauded for the creativity of this project but it's fallen to hobbyists and volunteers to engineer an entire suite of software to make this dead hardware work again, just because the initial developers were either too lazy, too shortsighted, or too restricted by bean-counters to develop open source (or at least self-hostable) software for these machines. You can't even change the server address of these things without hardware flashing and risking bricking your hub.

foresto•8h ago
I wonder if the author is aware of the health effects of handling thermal paper.

https://pmc.ncbi.nlm.nih.gov/articles/PMC5453537/

hagbard_c•8h ago
I suspect the author, like nearly all of us here will get more exposure to BPA from handling supermarket (etc.) receipts than from this gimmick.
SoftTalker•8h ago
I typically decline those.

Thermal paper was widely used for fax machines and portable printers years back as well.

aschmelyun•6h ago
Worse: I worked in grocery stores for years as a cashier lol
ryukoposting•5h ago
I'm pretty sure I ate some as a bet in high school.
SoftTalker•3h ago
I did too but the printers were still dot matrix with ink ribbons then.
flobosg•8h ago
BPA/BPS-free thermal paper exists; both chemicals are banned in the EU.
odysseus•8h ago
Anyone know where you can buy the wall map shown on the page?
jer0me•8h ago
It looks like this one from National Geographic: https://www.natgeomaps.com/re-world-decorator
qwertox•8h ago
That is a good map. So many recognizable names. Not that I'd recognize many, but those which I've searched for, they were present.
aschmelyun•6h ago
That’s the one! Got it from a local B+N.
bigbuppo•8h ago
I did that once. Spammers found it within 15 minutes.
whynotminot•7h ago
Were you getting random text? Or actual targeted spam?

For some reason I find it really funny to potentially be getting printed out adverts for shady boner pills or singles near you.

ok_dad•8h ago
This is really cool! I sent you an (hopefully) uplifting message for the week’s end. I know I shouldn’t but I really want to buy a receipt printer now!
derwiki•6h ago
They are well within the impulse buy zone, and it’s really easy to programmatically use with Python. Do it!
MomsAVoxell•8h ago
I have a clockworkPi dev console which has the built-in printer, and it has always been a 'quaint' accessory, but lately I have been looking at it with glee and wondering what strange and fruitful things I could do with it .. the first is of course a zine, for which it is the perfect printing device .. just carry it with me, print out this months issue, stable the whole sizzle together and duct-tape it in some random loo somewhere, as deserves all good zine format ..

So, yeah, there could also be a window of opportunity by which other readers of the zine could send their own message to be included in the distribution channel (i.e. the bog roll) and things could propagate.

Well, I guess the point is, that suddenly I think that receipt printers are really the only printer I want to deal with, ultimately. I've gotta stock up on rolls.

codazoda•5h ago
I love zine’s. There are tens of us. :)
James_K•8h ago
His printer prolly blowing up right now.
qwertox•8h ago
Wasn't there someone who had printers connected to the internet and a live video stream of the printers printing the messages?
brightbeige•8h ago
This one? https://signalvnoise.com/svn3/the-making-of-a-dumpster-fire/
wonger_•7h ago
Good Enough did something similar: https://guestbook.goodenough.us/
joshu•7h ago
receipt printers are a blast. at one point i was livestreaming chatgpt talking to humans via a printer: https://www.instagram.com/p/Cr04ofLsxtl/

at the time, the openai API and the printer max speed capped out at roughly the same time and would use up an entire roll in ~ 10 minutes. if you didn't wind the paper back up it would fill a whole garbage bag.

intheitmines•7h ago
If you do this be sure to buy BPA free receipt paper

Handling receipt paper is what turned out to be the cause of the high BPA numbers when boba tea was tested https://x.com/natfriedman/status/1899641377002025252

aschmelyun•6h ago
I did! I also use gloves when handling a large amount of the receipts.

I worked as a cashier for years in my teens and twenties though, so it’s probably already in my blood.

thousand_nights•6h ago
this one time when i was young and dumb and into smoking weed, i remember running out of rolling paper so i rolled a joint using a supermarket receipt i had and smoked it

this was like 20 years ago, still makes me shudder after i learned about the BPA stuff

cluckindan•6h ago
Fun fact, that extremely thin paper used in bibles is usually hemp paper.
vscode-rest•5h ago
Genesis 1:29, anyone?
trenchpilgrim•4h ago
A few years ago my friend's mother started using medical marijuana for pain management. My friend had to explain that no, you should not make a pipe out of a coke can because of the plastic liner, go to a head shop and buy a glass pipe like a normal person!
CaptainOfCoit•4h ago
> you should not make a pipe out of a coke can because of the plastic liner

I'm fairly sure it doesn't make much of an health impact considering the hot smoke you pull into your lung, but when I was kid and we made pipes out of cans in "emergencies" we'd use the outside of the can as where you put anything with fire, you don't have to turn it inside out to be able to smoke out of it.

brailsafe•1h ago
> we'd use the outside of the can as where you put anything with fire, you don't have to turn it inside out to be able to smoke out of it.

This is what I pictured, but now I'm curious how you'd use the inside of the can.

trenchpilgrim•1h ago
Heating up plastic gives off all kinds of really nasty organic compounds, far worse than the drug... doesn't need to be direct flame.
userbinator•1h ago
The products of combustion you inhaled are likely far worse.
brailsafe•1h ago
I mean... the weed was going to get smoked, it was definitely the receipt that was the foreign invader here.
why_at•6h ago
I'm surprised they didn't mention anything about preventing spam. The biggest thing that deters me from doing something like this is the idea that not long after I opened it up it would get hammered by bots so much that it would make the whole thing unusable.
aschmelyun•6h ago
Hey it’s me, the author! That was intentional as I honestly enjoy the trolling.

There’s a basic rate limiter set up to prevent misuse, and a character limit, but beyond that I just kind of wanted to see what people would send.

It’s been surprisingly chill, and I’ve only had to handle a few nonsensical text dumps or garbage messages.

codazoda•5h ago
How does the rate limiter work? IP?

Maybe tangential, but I just added a little 3-second delay to my stats counter. I’ll find out if that worked for the specific bots I’m trying to avoid in a couple days.

I might have to do this with my printer the Raspberry Pi 400 in my bedroom.

Animats•6h ago
Somebody did that back in the 1980s. They put a small printer into a phone that had the same form factor as a Western Electric model 500.[1] This connected to a PBX and printed "While you were out" slips. It was a real product, but did not catch on. Anyone remember that thing? I saw ads, but never one in person.

[1] https://en.wikipedia.org/wiki/Model_500_telephone

aschmelyun•6h ago
I have a rotary phone, a voip adapter, and have been writing a local SIP server for another experiment. I am insanely tempted to replicate this.
derwiki•5h ago
Which rotary? Classic AT&T?
Animats•4h ago
Why not, as a fun thing?

The problem with a production product is refilling all those little rolls of printer paper. They will always run out when no one is available to answer the phone, of course.

kristopolous•6h ago
I've fantasized about fax phone banks for artists to send things out periodically.

The idea of a machine unexpectedly popping out a sheet of paper has gone from "this is all spam" to delightful again.

Physical items in a physical space whereby you call a place and not a person.

We've digitally moved from spaces to individuals and I think that's the main critique of the modern web: somehow networked ourselves but abandoned the networking of ourselves.

You could even do it all digitally somehow and just hook it up to a modern network printer. Whitelisted senders get printed while unrecognized ones enter a digital backlog.

The real desire is to explore the psuedo anonymous nature of the early web in a way that is robust to abuse.

wholinator2•6h ago
I think the key point that would make this delightful is the whitelist. Lord knows the moment its opened up it'll be spammed with the worst things bored teenagers can find.
ianbicking•6h ago
I have wanted to do experiments with a receipt printer hooked up to a Raspberry Pi, with some simple controls... but every time I look up the cost of the printer I balk. It's probably not fair, but I guess in my head it feels like they should be cheaper. Or at least the cost then makes me question how much time I'm really ready to put into stuff like debugging the printer drivers and putting together a case, etc etc.

The thing I actually want to play with is probably some kind of board game that incorporates the printer... ideally with bar/QR codes so the computer can print out money, IOUs, instructions, etc., and have this computer mediation that still gives people physical items to manipulate.

aschmelyun•6h ago
While not an outright solution to the fact that they _are_ expensive, if you don't care about them being second hand or a little older you can score a pretty good deal on sites like eBay.

For instance, TM-T88V printers can do more but cost around 3x as much as the one I got, a TM-T88IV which is the older version. Not perfect, but beats the like $200 price tag brand new.

derwiki•5h ago
You can pick up a Rongta for $75 brand new
ValdikSS•6h ago
I wrote a CUPS (Linux) printer driver for Xiqi cheap ($10) Chinese label printers if anyone interested

https://github.com/ValdikSS/printer-driver-funnyprint

I use it to print barcodes, and it's very handy compared to serious enterprise printers: it's lightweight, battery-powered, and works over Bluetooth.

demetrius•4h ago
Russian writer Leonid Kaganov had this idea back in 2021, with an added twist that he also put the printer in his bathroom: https://lleo.me/dnevnik/2021/11/30
kleinishere•4h ago
For the many posters recommending BPA free paper - does anyone have suggestions / a link for a reliable seller?

I looked on Amazon after another receipt printer post on HN but couldn’t find anything that provided confidence in the BPA characterization. ULINE is quantities are absurd for personal use. Imagine their most be a decent alternative but never see any named.

toomuchtodo•4h ago
https://www.pca.state.mn.us/business-with-us/bpa-and-bps-in-...

(scroll to "Use alternative receipt paper": "Companies that offer phenol-free alternatives")

kleinishere•3h ago
Phenomenal. Thank you.
vayup•4h ago
I read the title as "massage me", and was very confused for a few seconds.
maxrev17•3h ago
We did this at uni - hpmprinter on twitter and it was on GitHub as twinter :)
maxrev17•3h ago
https://github.com/revitteth/twinter
DrawTR•2h ago
I've wanted to make a project w/ a receipt printer for a little bit now. Does anyone have any good suggestions for printer models?
liqilin1567•35m ago
It's kind of nostalgic and make me curious: Were there many magical things like this in the early internet days.