My Bosch Axxis Electric Condensation Dryer is making a rather large noise as it tumbles, as if something is lose and banging at a very rapid pace. It is drying properly but I imagine it is just a matter of time. What could it be?

Mine was doing the same thing- I dissassembled it and found that the noise was actually from debris in the fan. Get a good electric drill driver and the proper torx bit and pull it apart- be careful with removing the belt as the idler is strong enough to break the broken belt switch if you let it snap off.. Check the rollers too.. but most likely it is lint debris and coins etc.. inside the fan.. I have had to clean mine a couple of times since I have had the dryer.. it is about a once a year occourance.