Hi Slashee
Thank you for your answer. First, I cannot go to Show Configuration folder because I cannot start Cura without loosing my settings.
I find the file named voron2_300.def.json in folder C:\Program Files\Ultimaker Cura 5.1.0\share\cura\resources\definitions. But this has an old modification date, which fits the installation date of Cura. So I don't think, this is the cause. I tried to remove it without success.
The only new file there is voron2_base.def.json. I don't know, why it has a newer modification date. I attach it here.
It seems to reference an extruder file named voron2_extruder_0 which also has an old modification date. I attach it, too.
Strange is also that I now get two corrupt profiles: Voron and Voron_user. No Voron #2 anymore.
The only way to start Cura is to delete the folder C:\Users\<username>\AppData\Roaming\cura. But then I loose all my settings.
But what do I really loose this way? The printer settings itself is no great deal, because it's a standard Voron. But what about materials and some calibration settings like flow or something. Are these included my 3mf files of old jobs? For me it is very unclear where Cura stores which data. It would be much easier if there would be different file save/load options for things like materials, machine parameters, print profiles because then it would be clear. Now I never know where which parameters come from. So I always load an old project, delete all objects and insert the new ones.
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Slashee_the_Cow 450
If you just remove the the definition file for Voron #2 (looks to be called voron2_300), that should fix it. The error shouldn't affect other machines anyway, but it is a bit annoying. Ideally (it depends where you put it), your definition for Voron #2 is in the Cura configuration folder. In Cura, go to Help > Show Configuration Folder and look in the definitions folder.
If you saved it in the same folder as all the included definitions, by default (in Windows) that will be C:\Program Files\UltiMaker Cura 5.1.0\share\cura\resources\definitions\
If you created a custom extruder file for it, you'll also need to delete that from the extruders folder (in whichever location you ended up saving it).
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