Xpres Subli-Print Epson R1800: Feeder System Troubleshooting Guide - Manual (Page 11)

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9. If the nozzle check is still not perfect or almost perfect, you MUST leave the printer
turned and let it stand for 1-2 hours, or if you can over night.
Note: It is extremely important that the printer is left to stand for at least 1-2 hours.
10. Print a nozzle check to see if the printer has settled down. If not repeat steps from 1 – 9
until a perfect or nearly perfect nozzle check is printed.