After many complaints to the Cube3 engineers about my printer working for job after job only to fail when starting a new print job did it dawn on me that the user, in this case, might be to blame.
I believe that I was applying glue over old glue too many times and finally closing the critical gap. And, since I was letting the glue completely dry, it was acting as if it was the hard surface of the print plate and stopping the flow of filament.
My bad! :(
Now, you would think that with several years of 3D printing experience, I would know better. However, with the Cube2, the first layer of glue over a newly cleaned glass was less successful than a second coat of glue over a dried previous coat.
But, the tolerances for the gap was greater in the Cube2 than with the Cube3 gap. You can get away with one thin second coat and maybe even a third. But, beyond that it's probable that you will hear the dreaded "click, click, click".
Please don't let Cubify Support or the engineering team know that I made this confession. Who knows what they might do to me the next time I stop by Rock Hill next time I travel down to South Carolina to visit our Youth ChalleNGe cadets! If I suddenly disappear, you'll know somebody tipped them off.
Hmmmm.... I think it might be wise to start using an alias when contacting 3D Systems support with vociferous complaints.