I am watching the operation of my Cetus2 two-color printer. I discovered a way to implement what I call “shadow-purge” printing. When changing colors with a single nozzle printer, there is a period of time and distance required for one color to cease flow and the new color to fully become full flow. This period is call a purge.
The nozzle design of Cetus2 makes this time and distance very short. But it still exists for perhaps under a second.