Well, I’m not willing to put up with the lousy print from Version 5.1.4.10249. 
O. my ender 3 v3 KE all I have to do is set an M600 command in any chosen line after presing slice (look for the + sign). But if you prefer to use Cura, just go to modify gcode and choose filament change. Keep in mind that printer’s firmware has to admit it, wich is the norm.
it is now working i have no reason for it being fixed but it is.
After slicing is complete, look at the G-CODE tab in the preview tab, not the COLOR SHOW tab, to find the layer where you want to pause. Note that you should look at the layer number in the G-CODE, not at the bottom of the slicing software, as the layer numbers shown by the slicing software and the printer may differ.
