How do I calibrate my printer?
There are two ways to profile a printer device:
Using a photospectrometer device like the Pantone ColorMunki
Downloading a printing a reference file from a color company
Using a color company to generate a printer profile is usually the cheapest option if you only have one or two different paper types. By downloading the reference chart from the companies website you can then send them back the print in a padded envelope where they will scan the paper, generate the profile and email you back an accurate ICC profile.
Using an expensive device such as a ColorMunki works out cheaper only if you are profiling a large number of ink sets or paper types.
If you change your ink supplier, make sure you recalibrate the printer!