Express consumable costs ($10,200) to operate printer services offered free to Chem majors over 1.5 years. Paper costs NOT included.

Data and analysis

Page counts	Dates	Count of months	Avg pages per months (including summers) Most uses is Jan/Feb. and Aug/Sept	At 1.53 cents/ page, for just ink (a consumable)	At 0.36 cents/ page, for just maintenance kit (another consumable)	Cost for both consumables (NOT paper)
300,000	May 2011 - Dec 2012	20 months	15,000 pages /month	$4,590	$1,080	$5,670
240,000	Dec 2012 - Feb 2014	15 months	16,000 pages/ month	$3,665	$865	$4,530
Total: 540,000	May 2011 - Feb 2014	35 months	15,430 pages/ month	$8,255	$1,944	$10,200

Hardware costs, including "consumable" maintenance kits

Printer's initial cost, including 3 year warranty: $2,500

Amortizing cost of printer over 540K pages printed comes to 0.46 cents per page.

Cost for maintenance kits, up to now: $1,944

10 have been installed for the most recent 240,000 pages, at $86.40 each: $864 + $1 = $865
Thus estimate we 1.25 additional kits (~12.5 kits) for the first 300K pages printed: $1,080

Thus, $4,444 spent so far on hardware, including maintenance kits.

Ink cost calculations

Usage Dec 2012 - Feb 2014

Ink Stick color	Use	6 Sticks per package	Cost per package (These are Michael Hint's costs; Lars may pay more?)	Total costs
Cyan	28	4.67	$69.65	$325.26
Magenta	24	4.00	$69.65	$278.60
Yellow	22	3.67	$69.65	$255.62
Black	76	12.67	$221.40	$2,805.14
			Total ink costs for 240K pages:	$3,665

$3,665 for 240,000 pages comes to 1.53 cents per page, on average.

Paper costs

Cost for paper, up to now: $1,930

0.575 cents per page, if buying cheap and you don't care about the environment.
Total of 335,000 sheets of pater used.
- 149,000 paper sheets used for 240,000 pages printed.
- Thus estimate that an additional 186,000 paper sheets used for previous 300,000 pages printed.

Paper purchase cost options

0.575 cents/ page for Staples® Copy Paper, LETTER-Size, 92/104 US/Euro Brightness, 20 lb., 8 1/2" x 11", 5,000 Sheets/Ct (if $28.77 for 5000 sheets).

1.03 cents / page for Staples® 30% Recycled Copy Paper, LETTER-size, 92/104 US/Euro Brightness, 20 lb., 8 1/2"H x 11"W, 5,000 Sheets/Ct ($51.59 for 5000 sheets)

Contains at least 10% post-consumer recycled content

0.067 cents/ Staples® 100% Recycled Copy Paper, LETTER-size, 92/104 US/Euro Brightness, 20 lb., 8 1/2"H x 11"W, 5,000 Sheets/Ct ($33.43 for 5000 sheets)