For printer of that age it will be totally uneconomic even if you
can get anybody to do it. He will be better off buying a new
printer.
http://www.pcpro.co.uk/reviews/86254/lexmark-e120n.html
Is an example of what he can get for a budget price.
Peter Crosland
Every reveiwer seems to love the printer but the cost of consumables
for this model is rather high. See this:
------------------ START (EDITED QUOTE)
There are two consumables in the E120n, starting with a
photoconductor unit, which has a long life of 25,000, 5 per cent
pages and a low cost of around £35. The more important running cost
derives from the toner cartridge though, which lasts for 2,000 pages
and costs either £46 or £63, depending on whether you're happy to go
along with Lexmark's return programme.
Even using the substantially cheaper return programme cartridge, the
cost per page on this printer comes out at 2.91p, the highest figure
we’ve seen for a mono laser in the last eighteen months. If you
object to sending the cartridge back (or want to refill it), you pay
3.79p per page. It seems to us that this high running cost is likely
to promote refilling, rather than encourage recycling.
Verdict
In many ways, this is an excellent mono laser printer. It’s quick by
most standards, and very quick for a machine costing under £100. It’s
cheap to buy, it produces good quality prints and is very easy to
use. So why shouldn’t everybody dash out and buy one? Simply put,
it’s the most expensive mono laser to run that I’ve tested. Not by
much, but at 3p per page, you really need to value its other
qualities to justify the purchase.
------------------ END (EDITED QUOTE)
http://www.trustedreviews.com/article.aspx?page=6458&head=0