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White rectangular laser printer with top output tray and front paper cassette

Lexmark

Lexmark 29S0100 MS431dw Laser Printer

SKU CH-5GZ5-PMHD8 MPN 29S0100

Monochrome laser printer prints up to 42 ppm with automatic duplex and a 5.9-second first page

  • Power draw0.1 W (Hibernate Mode) 0.9 W (Sleep Mode) 4.9 W (Ready Mode)
  • Best suited forSmall Workgroup
  • Main functionsPrint
  • Display type2-line All Points Addressable (APA) monochrome LCD display
  • Printing typeMonochrome
  • Print technologyLaser
  • Fast 42 ppm output for high-volume workgroups
  • Sharp 2400 Image Quality at 600 x 600 dpi for crisp text
  • First page in 5.9 seconds reduces wait time
  • Automatic duplex printing cuts paper usage
  • 350-sheet standard capacity with 900-sheet maximum for fewer reloads

Compact monochrome laser for small workgroups

The Lexmark MS431dw is a single-function monochrome laser printer rated at up to 42 ppm with a first-page-out time of 5.9 seconds. It delivers 2400 Image Quality at 600 x 600 dpi and supports automatic duplex printing. A 2-line APA LCD provides local status and menu navigation. Standard memory is 256 MB and the monthly duty cycle reaches 80,000 pages.

Verify network, paper and mobile requirements

Confirm your infrastructure includes Ethernet 10/100BaseTX (RJ-45) or a compatible wireless network for Wi-Fi connectivity. The printer accepts PCL 5c, PCL 5e, PCL 6, PPDS, PostScript 3 emulation, PDF 1.7 emulation and Direct Image print languages. Standard input capacity is 350 sheets across two trays, expandable to 900 sheets with a third tray. Output capacity is 150 sheets. Mobile printing uses the Lexmark Mobile Print app, Mopria, AirPrint and Google Cloud Print; ensure devices support these standards.

Fits tight spaces and scales with paper demand

Physical dimensions are 8.7 inches high, 14.5 inches wide and 14.3 inches deep, allowing placement on a desk or shelf. Two standard trays handle everyday volumes; adding the optional third tray raises maximum input to 900 sheets, reducing reload frequency during large jobs. Duplex printing cuts paper consumption for double-sided documents. The 150-sheet output bin collects finished pages without a separate stacker. Wireless and Ethernet interfaces let the printer serve multiple users without a dedicated USB host.

How it compares

Measured against everything we stock in Monochrome & Color Laser Printers, at today’s prices. Recalculated every night.

Price $222.99
Cheaper than about 85% of the 2,183 comparable items (median $485.99).

Specifications

Product
Brand nameLexmark
Model nameMS431dw
Part number29S0100
Main functionsPrint
Printing typeMonochrome
Print technologyLaser
Performance
Monochrome print speedUp to 42 ppm
Monochrome print resolution2400 Image Quality, 600 × 600 dpi
First page out time5.9 seconds
Two-sided printingYes
Monthly duty cycleUp to 80,000 pages monthly
Maximum paper output150 pages 20 lb or 75 gsm bond
Processor
CPU clock speedDual Core, 1.0 GHz
Memory
Standard memory256 MB
Maximum memory256 MB
Display
Display type2-line All Points Addressable (APA) monochrome LCD display
Connectivity
Connection interfaceEthernet (RJ-45) / USB
Ports & slots
USB connectionsYes
Network interfaceEthernet 10/100BaseTX (RJ-45)
Power
Power draw0.1 W (Hibernate Mode)
0.9 W (Sleep Mode)
4.9 W (Ready Mode)
570 W (Printing)
Size & build
Product dimensions8.7 in × 14.5 in × 14.3 in
Product weight20.6 lb (9.34 kg)
Shipping weight10.89 kg
Package size418 × 414 × 282 mm
Compatibility
Accepted media sizesA6, Oficio, 7 3/4 Envelope, 9 Envelope, JIS-B5, A4, Legal, A5, Letter, B5 Envelope, Statement, C5 Envelope, Executive, Universal, DL Envelope, Folio, 10 Envelope
OS compatibilityWindows 10, Windows 8.1, Windows 8, Windows 7 x64, Windows 8.1 x64, Windows 7
Environment & compliance
Noise level (approx.)14 dBA (Idle)
53 dBA (Print)
More details
Best suited forSmall Workgroup
Print languages, std.PCL 5c Emulation, PCL 5e Emulation, PCL 6 Emulation, Personal Printer Data Stream (PPDS), PostScript 3 Emulation, PDF 1.7 emulation, Direct Image
Paper trays, std.2
Paper trays, max.3
Standard paper capacity350 pages 20 lb or 75 gsm bond
Max input capacity900 pages 20 lb or 75 gsm bond
Standard output capacity150 pages 20 lb or 75 gsm bond
Media formatPaper Labels, Card Stock, Plain Paper, Envelopes, Refer to the Paper & Specialty Media Guide

Questions about this item

Does the Lexmark MS431dw include a starter toner cartridge or must one be purchased separately?

The printer ships with a pre-installed starter toner cartridge so you can begin printing immediately; a full-yield replacement cartridge is sold separately.

Should I choose the standard 350-sheet input or add the optional third tray for 900-sheet capacity?

The standard configuration provides 350 sheets across two trays; adding the optional third tray raises total input to 900 sheets for larger workgroups.

What does the 42 ppm rating mean for everyday office use?

The 42 pages-per-minute speed applies to simplex A4/Letter black printing; duplex jobs run at roughly half that rate, and the first page appears in 5.9 seconds.

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