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Objects below the lint filter can cause a rattling noise. If your dryer uses rollers to support the drum, these can become worn out and make a lot of noise. You should have a technician replace the whole set of rollers, rather than just the damaged ones.
Correspondingly, why is my dryer making a noise?
Over time, the drum bearing wears out. If the drum bearing is worn out, the dryer may make noise. If the drum rotates freely, it is unlikely that the drum bearing is worn out. If the drum makes squealing or grinding sounds when turned and/or is hard to turn, replace the drum bearing.
Similarly, how do I know if my dryer bearing is bad?
The first indication of bad dryer motor bearings is a squealing sound from the dryer. When the bearings lose their lubrication, they heat up and change their shape. The lack of lubrication causes the metal of the bearings to make noise as it rides on the bearing race.
Gas and electric dryers have a motor that turns the blower and the dryer drum. A defective motor can produce a variety of sounds, such as a ratting noise from a loose pulley, a high-pitched noise from a bad bearing or bushing or a humming noise from a bad winding or switch on the motor.