Dropped something in printer

Best bet would be to carefully take the printer apart, and remove the object that fell inside. The more you use it with an obstruction, the more likely you are to cause permanent damage. If you aren't confident that you'll be able to get it back together properly and do not want to replace the printer, simply take it in to any computer repair store and they'll quote you a price. If there is no internal damage is should be fairy inexpensive.