Build Volume Error When Using Support Eraser

[Gaslov 0]

I am trying to remove some unneeded supports from my 3D print in Cura, however, I get this error:

 

Part I want to add a support blocker to:

 

 

After adding support blocker:

 

 

All the tutorials I've seen make it seem like this is supposed to be easy.  Just click on support blocker and place.  Is there a setting I need to uncheck somewhere?

[Gaslov 0]

In case you're curious, I'm printing it vertical likes this because I'm using a rainbow filament and want the color gradient in that direction.

Edited February 16, 2021 by Gaslov

[GregValiant 1,410]

In "Special Modes" you have "One at a time" selected.  Change that to "All at Once".

If you use One at a Time, Cura checks the height of the model and if it is taller than the "gantry" height it won't slice it.  Cura figures that the X beam will crash into a part.  The blue rectangle about 25mm above the build plate is the clue.

[Gaslov 0]

Thanks, that did it!