Our take
The Lexmark MS431dw is a monochrome print-only model for a desk or small workgroup that wants automatic duplex and a choice of wired or wireless connections. Lexmark rates it up to 42 pages per minute on Letter and 40 on A4. Its 250-sheet input plus 100-sheet multipurpose feeder gives 350 standard sheets, with 150-sheet output; an optional 550-sheet tray expands capacity. Lexmark recommends 800 to 8,000 pages monthly. The saved Amazon title and part number match MS431dw and 29S0100, but inconsistent all-in-one and ADF fields on that page are not used as product facts.
A small office needing a compact networked mono printer with duplex and optional paper expansion..
Choose a different model if you need copy, scan, fax, a larger included paper reserve, or a verified current toner and imaging-unit supply path.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Lexmark documents built-in Wi-Fi and 10/100 Ethernet alongside USB, giving more placement options than a wired-only printer.
- Automatic duplex, a 42 ppm Letter rating, and 350 standard input sheets fit a recurring small-office queue.
- An 800–8,000 page recommended monthly range gives a source-backed planning reference.
What to weigh up
- This is print-only hardware, so copy and scan jobs need separate equipment.
- The 350-sheet standard supply is smaller than larger workgroup configurations; the 550-sheet tray is optional.
- Amazon's non-title fields are inconsistent about all-in-one and ADF functions, while present offer condition and supply availability remain unknown.
The key details
| Model covered | MS431dw |
|---|---|
| Main functions | Print only; monochrome laser |
| Print output | Up to 42 ppm Letter / 40 ppm A4 |
| Two-sided printing | Automatic duplex; 350-sheet input and 150-sheet output |
Performance figures are manufacturer claims. Source checked October 4, 2026. Regional models and included accessories can differ.
What the features mean for you
The dw suffix belongs to a print-only configuration
Lexmark describes the MS431dw as a monochrome printer, not an all-in-one. The saved exact model and part are 29S0100. Copy, scanning, fax, and an ADF are not part of the reviewed feature set. Amazon's page title and product number match the printer, but other fields on that page inconsistently present all-in-one attributes; they are not used here. This is a useful example of why title and part number can support identity while the manufacturer page remains the source for actual functions.
Automatic duplex and rated speed support office output
Lexmark specifies integrated automatic duplex and a rate of up to 42 pages per minute on Letter or 40 on A4. Automatic page turning can reduce handling for two-sided reports, while the rating offers a manufacturer benchmark for print speed. Neither figure guarantees the same result for a complex file, a congested network, or an aging device. Ask the seller to demonstrate duplex and check the exact product label when buying a specific unit; the published rating does not establish its maintenance history.
The standard paper path can expand later
The MS431dw includes a 250-sheet input and a 100-sheet multipurpose feeder, with 150-sheet output. Lexmark lists a separate optional 550-sheet tray. The standard 350-sheet supply is suited to a more modest queue than a printer with several included drawers, while the optional tray can change that capacity if installed and compatible. Compare refill frequency with the actual workflow, and check whether any claimed accessory is included. The product page does not make an optional tray standard.
Built-in wireless and Ethernet are both documented
Lexmark lists Wi-Fi, 10/100BaseTX Ethernet, and USB 2.0 for the MS431dw. That supports direct connection or network placement over a cable or wireless link. Confirm network setup, host compatibility, and the actual radio and ports on an offered unit before planning a shared queue. A listed wireless feature does not establish current mobile software support for every phone or operating system. The link rate is specifically 10/100 Ethernet; do not infer Gigabit from a familiar office network.
Use the recommended range and verify the device
Lexmark recommends 800 to 8,000 pages per month; the separate 80,000-page duty cycle is a maximum ceiling, not ordinary workload advice. The recommended range can help compare the printer with routine office use, but cannot predict remaining life in a used machine. The exact Amazon ASIN B088MP21FB is supported by matching title and product number. That evidence does not prove current stock, price, toner condition, imaging-unit life, or a particular seller's included accessories. Check each detail before purchase.
What else to compare
Compare the M602x if a larger standard tray supply and higher monthly guidance matter most, or the M4020ND if you need a wired duplex printer with an unresolved regional Ethernet rate.
Before you buy
Does the MS431dw copy or scan documents?
No. Lexmark's exact MS431dw documentation identifies a print-only printer; the inconsistent Amazon fields are not used.
How much paper does the standard input hold?
The standard supply is a 250-sheet tray plus a 100-sheet multipurpose feeder, totaling 350 sheets.
Which network connections are built in?
Lexmark lists wireless networking and 10/100BaseTX Ethernet, as well as USB 2.0, for the MS431dw.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Lexmark MS431dw U.S. product page ↗ — checked October 4, 2026.
- Lexmark MS431dw product page, features and general, printing, paper handling and connectivity specs ↗ — checked October 4, 2026.
- Amazon title and product number match MS431dw / 29S0100; unrelated all-in-one fields excluded ↗Paid link · We may earn a commission. — checked October 4, 2026.
- Amazon US model listing checked October 4, 2026; current condition, price, and availability are confirmed by the seller.
The decision
The MS431dw is a well-specified small-workgroup mono printer whose automatic duplex and built-in Wi-Fi distinguish it from larger wired-only models. Keep its paper limit and the noisy Amazon metadata in view.
Is it the right fit?
Check the exact model and today’s offers on Amazon.