CET not printing white halfway through the print

[rjtwin]

I am kind of new to the flatbed printer but we are trying to print to dark materials. CET controller has an option to print white under spot
to make colors stand out on dark materials. Halfway printing we noticed the printer was no longer printing the white? Anyone
have this problem?

X-Press 500Q

 

[artbot]

have you printed much white with this printer? i'd first suggest that your white channels aren't set warm enough. as the print progresses, the heads are cooling a bit and the viscosity is then off.

 

[rjtwin]

have you printed much white with this printer? i'd first suggest that your white channels aren't set warm enough. as the print progresses, the heads are cooling a bit and the viscosity is then off.

Do you have any idea of the heat setting I should be using? I have not printed much white yet due to CorelDraw having issues with exporting Spot1 channel. I can get the ContourCut to export but when
it comes to the white channel I have not figured it out yet.