OKI ML3321

€495.00 (incl VAT)

A great all-round performer, the 136-column ML3321eco dot matrix printer is suited to a wide range of high speed data listing and multi-part forms applications. In-built power management technology reduces energy consumption, lowering running costs.

Cost-effective and ideal for retail and production, the reliable, long-lasting 136-column ML3321eco dot matrix printer produces a wide range of high-speed data listing and multi-part forms applications. Engineered to work in demanding environments, the tough desktop printer delivers fast throughput, flexible paper management with energy-saving technology.

Built to last - Tough desktop printer ideal for demanding environments

The robust ML3321eco dot matrix printer provides consistent, reliable performance with a high mean time between failures (MTBF) of 10,000 hours.

  • High durability 9-pin print head
  • High mean time between failures of 10,000 hours
  • USB and Parallel interfaces with RS232 and Network options
  • OKI Microline, IBM and Epson emulations

Efficient performance - Prints up to five copies of wide format documents simultaneously

The ML3321eco efficiently produces up to 5 copies simultaneously with fast print speeds of up to 435 characters per second (cps).

  • Up to 435 characters per second (cps)
  • Multi-part paper handling (original + 4 copies)
  • Scalable fonts and barcode support
  • Low-tear and auto-park help eliminate wastage

Multiple copies - High-speed data listing and multi-part forms applications

Printing a range of documents including receipts, invoices, picking lists, reports and spreadsheets with flexible paper handling, the ML3321eco dot matrix printer features top, bottom and rear paper input paths and built-in rear push tractor feed unit, along with a long-life, easy-to-change cartridge ribbon.

  • Optional bottom push and top pull tractor units
  • Easy-change 3 million character cartridge ribbon

Power-saving - Low running costs with OKI?s system on chip (SoC) technology

Helping to minimise running costs, OKI?s system on chip (SoC) power management technology reduces energy consumption.

  • Eco-friendly technology, sleep mode consumes just 1.5W

Product Specification

Printing Technology

Serial Impact Dot Matrix Method

Print Head

9 Pin

Dot Wire Diameter

0.34 mm

Print Direction

Bidirectional/Unidirectional printing, Short line-seeking printing

Graphic Resolution

Max. 240(H) x 216(V) dpi

Print Speed

Super Speed Draft : 435 cps, High Speed Draft : 387 cps, Utility : 290 cps, Near Letter Quality : 73 cps

Line Feed Pitch

4.23mm (1/6 "), 3.18mm (1/8 "), n x 0.35mm(n/72 ") (n=1-85), n x 0.18mm(n/144 ") (n=0-255), n x 0.12mm(n/216 ") (n=0-255)

Feed Speed

4.5 inches per second

Feed Rate

4.23mm(1/6?) line feed: Approx. 48 milliseconds

Paper Route

Manual (Top), Tractor feeder (Rear), Tractor feeder (Bottom), Cut sheet feeder (Rear)

Character Pitch

Super Speed Draft : 12.0 cpi
High Speed Draft : 10.0 cpi, 12.0 cpi, 15.0 cpi, 17.1 cpi, 20.0 cpi
Utility : 10.0 cpi, 12.0 cpi, 15.0 cpi, 17.1 cpi, 20.0 cpi, Propotional
Near Letter Quality : 10.0 cpi, 12.0 cpi, 15.0 cpi, 17.1 cpi, 20.0 cpi, Propotional

Printing Width

136 characters/line at ANK 10 cpi


IEEE1284-1994 Bi-directional Parallel, USB 2.0 (Full Speed), (Optional) 100BASE-TX/10BASE-T, (Optional) RS-232C (25pin)


OKI Microline, ESC/P emulation, IBM ProPrinter emulation

Supported OS

Windows 7, Windows 7 x64, Windows Vista, Windows Vista x64, Windows Server 2008 R2, Windows Server 2008, Windows Server 2008 x64, Windows Server 2003, Windows Server 2003 x64

Receive Buffer

Max. 88KB

Resident Font

High Speed Draft, Utility, NLQ Courier, NLQ Gothic, Scalable Courier, Scalable Gothic, OCR-B

Font Style

Bold, Double Width, Double Height, Emphasized, Italics, Over score, Underline

1-D Barcode

UPC-A, UPC-E, EAN8, EAN13, Code39, Interleaved 2 of 5 (ITF), Code128, POSTNET, Codabar (NW-7), Industrial 2 of 5, Matrix 2 of 5

Paper Type

Continuous paper, Continuous copying paper, Cut sheet, Card, Envelope, Label

Paper Weight Adjustment


Paper Size

Continuous paper: Width 76.2-406.4mm x Length 76.2-355.6mm
Single part paper: Width 99.1-363.2mm x Length 99.1-356.0mm
Multi part paper: Width 76.2-406.4mm x Length 76.2-355.6mm

Paper Weight

Continuous paper : 45 - 90 gsm
Single part paper : 45 - 90 gsm
Multi part paper : 35 - 40 gsm

Copy Capability

Normal print mode: original + 4sheets(Total Thickness < 0.36mm)


552 x 345 x 147 mm

Operating Environment

Operating: 5 - 35 ?C, 20 - 80 %RH
Storage: -10 - 50 ?C, 5 - 95 %RH
No condensation

Power Source

Single phase 220 - 240 VAC ?10%, 50/60 Hz ?2%

Power Consumption

Operating: Max. -W (ISO10561 (Utility, Range1) Printing Approx. 36W)
Power Save: < 1.7W

Safety & Environment Regulation

Energy Star, CE Mark, EMC-Directive, GS Mark

Noise Level

Operating :Approx. 57 dBA
Idle: < 0 dBA
Power Save: < 0 dBA or Background level
Quiet Mode: < 52 dBA

MTBF(Mean Time Before Failure)

10,000 hours

Ribbon Life

Black : 2 million characters

Print Head Life *1

Approx. 450 million strokes/ pin

In the Box

Ribbon cartridge, Power cable, CD-ROM, Others