This problem could be an easy one. If you have an inkjet printer, it’s likely that the device’s horsepower is simply not enough for your needs. Laser printers are usually used more in business because they are capable of printing crisp text and at a lower cost.

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If you have a quality laser printer, it's possible your settings are off. If you’re in draft mode, switch to a higher quality mode and make sure the paper type listed on the screen matches what you’re printing on. Also make sure your toner cartridge is still responding. Sometimes the toner has settled and can benefit from a good shake. If that doesn’t do it, it may be time to replace the toner. 

For inkjets, you can try a nozzle cleaning and print head alignment, which you can launch from the printer's maintenance menu.