A 600dpi (dots per inch) print resolution is better if you use lots of graphics.
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Check the printer has sufficient memory for printing graphics.
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Ask about 'green' features, such as power-saving 'sleep' mode, low or zero ozone emission, refillable toner cartridges, etc.
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'Windows' printers are generally cheaper than 'Laserjet-compatible' or Postscript printers, but use your PC to process the pages. This can mean longer overall printing time.
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The price of laser printers starts at around £300.