Esc> C Set Print Density Light; Esc> D Set Print Density Medium; Esc> E Set Print Density Normal; Esc> G Set Print Density Dark - Dymo LabelWriter 450 Duo Label Printer Technical Reference Manual

<esc> c Set Print Density Light
This command sets the strobe time of the printer to 75% of its standard duty cycle.
<esc> d Set Print Density Medium
This command sets the strobe time of the printer to 87.5% of its standard duty cycle.
<esc> e Set Print Density Normal
This command sets the strobe time of the printer to 100% of its standard duty cycle.
<esc> g Set Print Density Dark
This command sets the strobe time of the printer to 112.5% of its standard duty cycle.
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