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Hi there, I print building plans. It only started today but my prints get halfway (ish) through and the black in just stops.

 

The quality at first is good, but then just nothing from the black. The other colours continue to print ok but nothing from the black.

 

I have cleaned and cleaned and cleaned the printhead thrugh the onboard diagnostics,

 

I have aligned the printhead also through the onboard diagnostics/tools but it still only prints black on the first half of the print!

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