DaVinci Junior cartridge reset (Page 7 of 58)

I can't really offer much but moral support.  I hope somebody eventually comes  up with something as I have one coming for Christmas.  I am assuming many others do too.

Ordered a Bus Pirate and an NFC Module for my Arduino.

One quick question, if the password is derived from the manufacturer programmed fields (Pages 0-3) or 4/5 which seem to be the same for all spools.  What happens if you take a random NFC chip (non XYZ) and check the status while listening in on the I2C bus?

Does it try to authenticate using a password that it creates based on the values stored on the non XYZ chip?

If not what happens if you change page 4/5 to match the XYZ chip?

I imagine since the password is different for each spool that the password is generated based on data that is different for each spool.

Pages 00 and 01 are different. We know that the first byte of page 00 is 04, and the first byte of page 01 is 22.

I have not caught any type of pattern yet but I'm not experienced in cryptography.

The ones i ordered was missing the option to overwrite the uuid and several other pages. I am currently looking to either buy some that can be completely overwritten or a NFC-simulator.

Greetings, everyone!
As I received a DaVinci Jr as a Christmas gift, I am so hoping you good folks can come up with a workaround for this! After leveling the bed and tinkering a bit, I am quite impressed with its performance (given its price tag). And I really would love to see the NFC defeated entirely mostly because I want more control over my printer. The PLA XYZPrinting supplies for this printer seems to be of at least pretty decent quality thus far and I can't say I have any issues with it. The limited colors is disappointing but most of what I've been printing is merely structural components and color isn't really a big deal. Might be in the future though.

I'm now down to the last 4 meters as reported by the printer although there is definitely more than 4 meters left on the roll. Of course I've ordered more, but would love to have a little more flexibility in materials.

All that being said, and after having read through this thread, I'm wondering if anyone has tried just making a full copy of a brand new, valid card and cloning it to a new blank. Would that work? And, if so, in the process of cloning the card, could one change the filament qty to something else - say 999 meters? It would be interesting to see if there are any "sanity" checks taking place like, all valid spool amounts are between 0-300, or 0-500, 0-?.

I don't think there are any ntag2xx nfc tags that allow the UUID to be overwritten.  There are other types but not ntag2xx.

The problem also without the password there is no way to get the data to write to the NFC unless you use some of the dumps posted in this thread.  Also, I don't know of any android apps that read/write password protected ntag2xx or Mifare Ultralight C tags.  So without some tools might be difficult and not feasible for the average consumer (which I am assuming they are trying to prevent from bypassing their DRM).

Hopefully somebody maps everything out and comes up with a Repetier flash as would would solve everybody's problems.

Just curious if anybody who was working with the 3w decrypting created a new file and changed the filament required to a lower number?

I was planning ordering a few spools to play around. Nobody seems to have any in stock. Amazon is sold out.  If they are going to force people to buy their filament they should make sure the stores stock it.

Hi. I find out how to save some filament amount recorded on NFC . Do not print to 0. Leave one meter oe les on the chip. I was need print bear mug it uses 91m of filament. In new spool i put NFC with 1m left filament. In Gcode changed filament usage to 0 and printed all mug. I saved 90m on NFC

So, I'm just a bit confused... Left about 1m on the chip, new spool with old (<1m) chip, alter GCode to change filament usage to 0, print, and it ADDED 90m to the tag? Or it just used the 1m left on the tag and continued to print anyway? Is the tag now reporting 0m left? So many questions!

NFC doesn't need physical contact to write to the chip.  It was confirmed that data on the chip does indeed change as the filament is used.

How did you get that code you posted?  Decompiled XYZWare?

ok maybe i am wrong but i think this is what hes saying

use your spool like normal until it gets low lets say 1m. change that spool with a new spool (not xyz spool) but use that chip print a big project (you can only use this chip 1 time because it will read 0 after you print) when the printer says low filament just hit ok.

no clue what he means about modding the gcode.

i do not have a low card to test this so not sure if t works or not

might be a way to save a little money if it works

He means you need at least 1m left. (anything less than that, the printer reads zero and will say unrecognized cartridge.)

In his example, he had a roll with 91m left. He took a project out of slic3r, modified the gcode to read 0 filament usage, converted it to 3w (there's a few ways to do this... would love to know the exact way he did it for confirmation)

Apparently this results in the printer to defaulting to 1m so it still costs a bit off the chip, but you use the chip for a much longer period of time. So he was left with a chip that had 90m left.