This video shows a Samsung dryer that is vibrating like crazy and making a lot of noise. Service tech replaced idler pulley (a common problem) but that did not help. The actual problem was the blower wheel. Replacement part is readily available at low cost. The repair requires on a few common tools and -- if it's just clumped lint then there is no cost to the repair (other than time).

It goes without saying but my lawyer would probably want me to remind people to PROCEED AT YOUR OWN RISK! THE AUTHOR OF THIS VIDEO ASSUMES NO LIABILITY FOR THE INFORMATION PROVIDED!