Conversation so far:
what is the role of a drum in a photocopier
The drum in a laser copier/printer is a vital component that receives the image from the laser and transfers it to the paper to produce the final print.
what happens if the drum becomes damaged in a photocopier
Damage to the drum may cause unwanted markings on the printed page or deletions of the image. Laser printer drums have a limited life span.
what is the lifespan of a drum in a photocopier
Many factors determine drum life, such as temperature, humidity, type of paper, type of toner used, and pages per print job. Average drum life is estimated at 12,000 pages.
what are methods to increase the life of a drum in a photocopier
Leave the lid down – always! Opening the lid of the copier is bad news because it significantly reduces the lifespan of the drum – which can be expensive to replace.

Question: what is the replacement cost of a drum
Self-contained rewrite: what is the replacement cost of a drum in a photocopier