LaserJet 5100

Introduced in 2000, the LaserJet 5100 refreshed HP's wide-format line with a faster engine and improved paper handling, carrying A3 monochrome printing into a new decade of offices. HP kept the cartridge family unchanged: 29A (C4129A) standard, or the high-yield C4129X (HP 29X). This page lists the high-yield cartridge only — a MICR single for check work and multi-packs of two, three and five, one of them a premium build.

Keeping the same cartridge across a model refresh was a deliberate kindness to fleets: offices that replaced a worn 5000 with a 5100 did not strand their toner shelf. The 5100 itself settled into the same work — wide spreadsheets, plans, signage — with a bit more pace behind it. You will still find them in facilities departments and school offices where the tabloid capability is used weekly and the machine's simplicity is used daily.

Toner Cartridges for LaserJet 5100

All five listings sold for this printer:

C4129X MICR — Black (MICR formulation)
C4129X 2 Pack — Black
C4129X 3 Pack — Black
C4129X 5 Pack — Black
C4129X Premium 5 Pack — Black

Which cartridge should you buy?

The 5100's faster engine argues for keeping the shelf ahead of the machine. A two-pack of C4129X is enough for a 5100 that prints wide pages a few times a week. Where the printer anchors a department's tabloid work, the five-packs remove reordering from the monthly routine altogether — pick the premium build if your office standardizes on it, the standard five-pack otherwise. The MICR single is not a general-purpose alternative; it is the check-printing tool, and only that.

Chip, toner and everyday use

An aging wide-format printer rewards small habits. Warm the cartridge up to room temperature before installing if it has been stored somewhere cold, and rock it slowly so the toner level settles evenly across its length — a cartridge this wide can print one pale edge for pages if the toner rides up at one end. The low-toner message is coverage-based arithmetic, not a sensor reading of what remains, so dense plan sets will summon it early. When it appears, check the shelf before the panic: with a spare C4129X on hand it is a two-minute event.

Frequently Asked Questions

Did the 5100 change cartridges when it replaced the 5000?

No — and that was the point. The 5100 kept the HP 29 family, so the high-yield C4129X on this page also fits the older 5000 line listed below.

Is there a standard-yield listing for the 5100 here?

Not on this page. The C4129A standard cartridge fits the printer, but the shelf here is high-yield only, from the C4129X MICR single up to five-packs.

One edge of my tabloid prints is pale. New cartridge?

Try distribution first: remove the cartridge and rock it end to end several times. Wide cartridges settle unevenly in storage, and an even toner bed usually restores the weak edge.