Zebra Z4MPlus not printing dark enough
In your label software there should be a setting option for print darkness (I assume it adjusts the head temperature) In ours (bartender) you can get to it when you select 'print' and a window appears with a 'documents properties' button. Click on this and select options and a darkness bar appears which you can adjust. You may also need to slow the label print speed if the darkness adjustment is not enough. I suspect it isn't in the printers best interest to run the print head at maximum darkness/heat so a sensible balance of darkness and print speed is best.
Another, less likely, possibility is an incompatability between the label material or surface finish, and the ribbon type. We did have a problem once whem Homebase changed their price label design and we had to test a load of other ribbon types until we got one that did the job. A chat with the label or ribbon supplier is always usefull, they sent us several sample bits to test.
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