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Cura not switching to .8 printcores

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I switched out both .4 printcores to .8 printcores.

But in Cura it does not switch to .8 printcores. When I click on the printcore2 tab I see 'Automatic BB0.8' and BB0.4. When I select the Automatic BB0.8, it stays on BB 0.4.

I can't get it to switch to the new installed core BB0.8.

Any ideas.

(This is a new UM3).

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Yes, the printer sees that the NFC is present.

And it labels each of the spools of material correctly. 1-PLA and 2-Natural PVA. Yesterday, I did a factory reset on the printer and put the AA/BB .4 back in.

And I did a calibrate. It (Cura) recognizes the .4 AA and BB .4.

I will try the .8 AA and BB tomorrow.

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I meant that last sentence to be the UM3 did not recognize the AA/BB .8 printcores.

...but this means that there's something wrong with the printcores and not with Cura.

If the printcore itself - (and the printer as a consequence of this) is reporting the wrong size, how should Cura be able to correct this?

Is it possible, that your printcores are labelled wrong, or programmed wrong?

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