Below are some facts that are related to the drum of a printer:-

1. The life expectancy of a printer drum can last between 10000 to 50000 pages before it should be replaced.

2. Print volume and conditions are the parameters which determine the replacement of the printer drum.  

3. The cost of a new printer drum may range between $50 to $300.

4. Every printer has its own printer drum which is compatible only with that printer.