What system of filament RFID identification is used for Snapmaker U1? Is it in-house, compatible with Bambu Lab or another manufacturer, or is it some open system like GitHub - ELEGOO-3D/ELEGOO-RFID-Tag-Guide: This document details the data structure and content format to be used on RFID tags for ELEGOO's FDM 3D printing filament spools. ?
Thank you for your answer.
I’d also like to learn more about this. Ideally I can add my own rfid stickers to generic spools and benefit from the smart features.
So far they haven’t said anything beyond it’s compatible only with Snapmaker’s RFID tags and otherwise others will need manual entry.
(It sure would be swell if all manufacturers or a group of them could invent a shared standard! Imagine the favor you would win with the consumers. 
)
Bambu is using special RFID tags so you cant clone or simulate them.
This is no feature for the customers, it is a feature for the after market sales.
Yeah, that’s the likely calculus of it. Understandable enough, but really itching for an open standard. It does feel like magic when you put a known spool on and it just knows what it is.
Its a standard realization of RFID with MIFARE CLASSIC 1K chips.
As I recall there is an open source standard for RFID but I don’t think any of the manufactures are using it.
You can find some information in this video : https://www.youtube.com/watch?v=X9oqZxi5NVQ with Blayne Sapelli (at about 45:00) in the next layer Podcast. Blayne seems interested in an open-source RFID standard and the TigerTag techno. I don’t know, but it doesn’t seem ready yet (or he doesn’t want to give an annoncement too early). It’s interesting, but I guess there’s probably a financial agreement between Snapmaker and Polymaker and that’s blocking this development of an RFID universal standard now I guess. Maybe my English isn’t good enough to understand Blayne’s thoughts !
I think Blayne is walking a tight rope of what he can say about R&D and what he thinks they should do when talking publicly. I got the impression that he was for the open source RFID tags and was trying to convenience SM to go that direction.
Hi
I’ve just seen something about a nightly build or firmware beta release that allows for generic RFID tags to be used and be read by the U1 side loaded filament readers.
Anyone able to comment on the RFID tag format, is it compatible with OpenPrintTag?
Mike
You are talking about this video - https://www.youtube.com/watch?v=UvEITdAEnxE
And it is about this firmware - https://forum.snapmaker.com/t/custom-firmware-for-snapmaker-u1-enhanced-features-webrtc-camera/
OpenPrintTag hardware specs are not released. So it is not possible to tell with certainty what is or is not compatible with it.
By the looks of it, openPrinTag is using NFC tech. Where U1 has RFID (mifare 1k tags) they are not compatible. Unless you swap upgrade the reader on U1, install drivers to the Linux head, and make it all work with klipper.
The current U1 reader does not support OpenPrintTag. OPT uses SLIX2 with ISO 15693 framing, which is not supported by the FM17550 reader used in U1. U1 only supports ISO 14443 A/B.
My firmware adds a support low-cost NTAG21x tags, which can be programmed with any Android or iOS phone. It implements RFID Tags | OpenSpool format.
The MIFARE Classic 1K used by Snapmaker spools relies on asymmetric cryptography to validate the signature of written tags.
Thank you for clarifying @paxx12, and it was your work I saw on a YT channel that dropped in my feed. I haven’t visited your Github yet, so asked the question here. Appreciate the link too.
Mike