How can I catch more lint in my dryer?
They sell inline lint traps, that can be installed along the exhaust vent.  



This should catch most; if not all of the excess lint, and give you a convenient easy way to clean the lint. The lint should be cleaned often (along with the dryers internal lint trap), to increase dryer efficiency and decrease the chance of fire.

Keep in mind, these are recommended to be used with a "booster fan" setup. If your exhaust line is longer than about 6' (1.8 m), you'll have to install a dryer booster fan to safely use one of these lint traps.

If you have a gas dryer, you may not be able to use an inline lint trap. Check with the manufacturer of the dryer, before installing a lint trap like this.

Warning

They sell products like this that have an open front, that "deflect" heat into the house.  These are not a good idea, since they also "deflect" moisture into the home which can lead to mold and poor indoor air quality.