While I’m awaiting for my printer, which is horrible that I have to wait over a month 
I wonder if did anyone tried the trick with custom gcode that retracts filament slightly during color swap? The question is if the nozzle differs much from the X1? What are dimensions of hot and cold part? Does anyone knows it?
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try using 0.5 in filament flush recal, print multi object instead of one, use flush object, flush into infill if dark outside colour.
Yes, I know that. I’m interested in the retract tweak that some users applied on X1 machines. And they retract 20mm but A1 has different hot end.