Reading the article, it looks like so far they only have a working resettable fuse (a passive device), and only hypothesize that a transistor was possible with the copper-infused PLA filament. So no actual working active electronics.
And from the paper linked in the article[1], it seems the actual breakthrough is the discovery that copper-infused PLA filament exhibits a PTC-effect, which is noteworthy, but definitely not "3D-Printed Active Electronics" newsworthy.
Oh so this is another scam like the MIT Food Computer. At this point I assume everything coming out of MIT is a scam until independently validated by disinterested third parties
Long, long ago, Tunnel Diodes were going to usher in an era of ultra-fast computing because their negative resistance region allowed for current gain in the simple 2 pin device.
It didn't work out for most of it, but does show that you can do logic without transistors.
Think of these as incredibly slow negative resistance devices. Computing with them might be possible, barely. But sometimes that's all you need.
> This is, to the best of our knowledge, the first report of fully 3D-printed resettable fuses.
I think unique the contribution is that the entire circuit -- active and passive -- can be made with this one single material. Normally, you need to use many different materials and chemical baths to make a circuit with active components, but using this metal-polymer mix, you can _just_ deposit the metal and you are finished.
>"They saw an interesting phenomenon in the material they were using, a polymer filament doped with copper nanoparticles.
If they passed a
large amount of electric current into the material, it would exhibit a huge spike in resistance
but would return to its original level shortly after the current flow stopped."
This is interesting -- large amounts of current being associated with increased resistance...
I have never seen or read about something like that with respect to other electronic components or systems.
It would be an interesting experiment to see if this effect could be simulated, and if so, under what conditions, in non-nanoparticle standard regular-sized electrical components...
I'm guessing (but not knowing!) that you'd you'd need a very high amount of current (like something from a car battery), but at a very low voltage, like maybe 0.1 or 0.01 volts (or less), and maybe like a very thin long wire made of some mostly-conducitive material, and then maybe something at some scale or low voltage if the experimenter was lucky...
Anyway, large current associated with increased resistance... I've never heard of that one before, except I suppose if the current heats the electrical path so much that it destroys it... which would be different for different materials, voltages, cross-section of conductors, temperatures, etc., etc.
I'd assume that wouldn't happen at the nanoscale and/or in a switching semiconductor... but perhaps I might be wrong on some level...
Reading the article, it looks like so far they only have a working resettable fuse (a passive device), and only hypothesize that a transistor was possible with the copper-infused PLA filament. So no actual working active electronics.
And from the paper linked in the article[1], it seems the actual breakthrough is the discovery that copper-infused PLA filament exhibits a PTC-effect, which is noteworthy, but definitely not "3D-Printed Active Electronics" newsworthy.
[1] https://www.tandfonline.com/doi/full/10.1080/17452759.2024.2...
> So no actual working active electronics.
Oh so this is another scam like the MIT Food Computer. At this point I assume everything coming out of MIT is a scam until independently validated by disinterested third parties
This is like posting "Landing on Mars" and all you did was catch a reusable rocket.
Long, long ago, Tunnel Diodes were going to usher in an era of ultra-fast computing because their negative resistance region allowed for current gain in the simple 2 pin device.
It didn't work out for most of it, but does show that you can do logic without transistors.
Think of these as incredibly slow negative resistance devices. Computing with them might be possible, barely. But sometimes that's all you need.
They arent dead!
Diy 8ghz (sampling) oscilloscope with tunneling diodes https://hackaday.io/project/167292-8-ghz-sampling-oscillosco...
I thought resettable fuses were already polymer based?
PPTCs are just plastic and metal with no semiconductors afaik
Is this actually an MIT article?
From the paper,
> This is, to the best of our knowledge, the first report of fully 3D-printed resettable fuses.
I think unique the contribution is that the entire circuit -- active and passive -- can be made with this one single material. Normally, you need to use many different materials and chemical baths to make a circuit with active components, but using this metal-polymer mix, you can _just_ deposit the metal and you are finished.
>"They saw an interesting phenomenon in the material they were using, a polymer filament doped with copper nanoparticles.
If they passed a
large amount of electric current into the material, it would exhibit a huge spike in resistance
but would return to its original level shortly after the current flow stopped."
This is interesting -- large amounts of current being associated with increased resistance...
I have never seen or read about something like that with respect to other electronic components or systems.
It would be an interesting experiment to see if this effect could be simulated, and if so, under what conditions, in non-nanoparticle standard regular-sized electrical components...
I'm guessing (but not knowing!) that you'd you'd need a very high amount of current (like something from a car battery), but at a very low voltage, like maybe 0.1 or 0.01 volts (or less), and maybe like a very thin long wire made of some mostly-conducitive material, and then maybe something at some scale or low voltage if the experimenter was lucky...
Anyway, large current associated with increased resistance... I've never heard of that one before, except I suppose if the current heats the electrical path so much that it destroys it... which would be different for different materials, voltages, cross-section of conductors, temperatures, etc., etc.
I'd assume that wouldn't happen at the nanoscale and/or in a switching semiconductor... but perhaps I might be wrong on some level...
Lightbulbs? High amount of current increases resistance.
Deleted.
Did you comment on the wrong post? Or did the link get swapped out on you?
Thanks. Don't know what happened:
Intended to comment on
"Show HN: HN Update – Hourly News Broadcast of Top HN Stories (hnup.date)"
at
https://news.ycombinator.com/item?id=41893524
but apparently somehow posted to
"3D-Printed Active Electronics (news.mit.edu)"
at
https://news.ycombinator.com/item?id=41893524
Just deleted the post at
"3D-Printed Active Electronics (news.mit.edu)"
and submitted the post to
"Show HN: HN Update – Hourly News Broadcast of Top HN Stories (hnup.date)"
Thanks.