This problem is common, there are three solutions when encounter in this problem.

First look at whether the pattern itself is high-definition, high-quality, if the quality of the pattern itself is not enough, then the printing effect is bound to blur.

The next is to clean the print head, if the pattern itself is high-definition, then use the software to clean the print head, it can make effective improvements to the print results.

If the above method is not ok, try reinstalling the print driver (software).