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Material list lost in Firmware UM3 Ext


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Posted · Material list lost in Firmware UM3 Ext

Well, now it got me.

What did i do? I had the impression of underextrusion with the Bondtech-Update and 311 Steps/mm. So i measured and corrected to 327 after reading this thread:


Now i got the correct extrusion of 100mm.


But i lost the material list on my printer. By now i tried a factory reset on the printer - still no material list.

The Message is "No profiles for an Ultimaker 3 unkown". The printer recognizes itself as "Hardware type ID: 9511" - a UM3 Extended, and that is true.

But "Type: Ultimaker 3 unknown" is wrong. And it also complains about a non-compatibility of black ABS with printcore AA 0.4. I can load UM-Material (NFC-magic!)


I found:


1 - Firmware-Version is - no downgrade with USB possible. This firmware worked fine until today.

2 - the printer shows itself as Hardware type ID 9511 at the printer. But he seems to miss something.


As far as I understand, the printer reads um3.json (with Ultimaker 3 unknown) and finetunes it with 9511.json to Ultimaker 3 extended.


How can i reset to a plain latest firmware? Well, i downloaded


and installed it via USB (had to scroll a bit). Then filling the Bondtech corrections into um3.json and moveMaterialProcedures.py


Phew! Maybe a typo somewhere. Glad i could solve it myself. 🧐

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    • 2 weeks later...
    Posted · Material list lost in Firmware UM3 Ext

    My guess is that at your first change to the um3.json file you made a typing error. This file is not intended for modifications by users and therefor lacks any error checks. Any small error in the json file will create big problems. Hence the advice to always first make a copy of the file before you modify it.


    Without a backup copy of the json file the only way to fix this is by updating the firmware, either through the network or from USB.


    Glad to hear you were able to fix it yourself.

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    Posted · Material list lost in Firmware UM3 Ext
    19 minutes ago, CarloK said:

    This file is not intended for modifications by users and therefor lacks any error checks.

    Guess so. And i did not care for the fundamental Linux-Rule: make a copy first, then fill in your typos 🙂


    Still, i'm a little puzzled, because the bondtech-value of 311 produces visible underextrusion. And it was not that easy to figure out how to extrude 100mm. Yes, this stuff is not intended to be managed by the user and I'm very glad, the Ultimaker-Machines are really Plug-and-Print.

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