If the print blurs

If, duplicates the printed image with the use of foreign toner or toner will not adhere firmly, helps to look at the manual.
Open Start \ All Programs \ Printers \ Dell 1250c Color Printer \ Toolbox and User Guide. In the manual, on page 103, the procedure is described. (And also many settings concerning print quality)

"Setting the Printer \ fuser" go in the toolbox, all values ​​to 1 - 3 provide.
(With "Normal" - 1 start) test.
If the paper curls strongly, may turn around.
Select If you print on stronger material, essential in the Print Settings \ Paper / Output \ paper the thicker material (lid).
The process is probably the same for the successor models.