A sheet is not a page
It is the most widespread miscalculation in offices. Toner yield is counted in printed pages, not in sheets loaded. With duplex, a ream of 500 sheets produces 1,000 pages: you halve your paper budget, your toner goes down at exactly the same rate.
In other words, duplex by default is an excellent thing — but if you find your toners last less long since you started printing double-sided, it is an optical illusion: you are simply printing more pages with the same number of sheets.
What duplex really changes
Two real effects, both favourable:
- paper, halved — at office volumes, that is a line item worth as much as the toner;
- filing and postage, for the same reason.
One point to watch: passing twice through the fuser heats the sheet more. On thin or damp paper that can cause curling; stay within the 60 to 163 gsm range the machine provides for.
151A or 151X, on a 40-page-per-minute machine
The 151X holds about 9,700 pages against 3,050 — three times more, for one intervention instead of three. On a machine capable of 40 pages per minute with a 350-sheet tray, the pace is rarely trivial, and high capacity pays for itself quickly.
The 4103fdw is the same machine with a fax and takes the same toners; so does the 4003dn, in plain printer form. Do beware of the 150A of the LaserJet M111 and M141, which shares nothing but the sound of the name.
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