Attached is a spreadsheet that is using data that is almost 2 years old. Since it is in Excel, you may be able to update the numbers with current data. This was provided to me by Kevin Reidy who used to be the Sr. Strategic Products Sales Manager for Ricoh.
I remember him saying at the time that if an HP Plotter was going through a roll of paper a month (150 prints) then you could place a 240W for less than the supply costs of the HP.
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