Toner Save Mode; Resolution Improvement Technology (Ritech) - Epson AcuLaser C4100 Reference Manual

Toner save mode

To reduce the amount of toner used in printing documents, you
can print rough drafts using the Toner Save mode.

Resolution Improvement Technology (RITech)

Resolution Improvement Technology (RITech) is an original
EPSON printer technology that improves the appearance of
printed lines, text, and graphics.
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Getting to Know Your Printer