Automatic toner replenishment: thresholds, forecasts and avoiding waste

Why automate toner at all

On an all-inclusive contract, toner is your cost and the customer’s problem when it runs out. Waiting for the customer to ask means emergency deliveries, a stopped machine and an irritated office manager. Shipping on a fixed schedule means cartridges piling up in cupboards. Automatic replenishment aims for the middle: each cartridge arrives a few days before it is needed, and not before.

Getting it right depends on two things: what the printer can tell you about its toner, and how you turn that into a shipping date.

What the printer actually reports

Networked printers report supply levels over SNMP, through the standard Printer MIB supplies table or the manufacturer’s own data. The quality of that information varies.

• Many current copiers report a percentage, sometimes in whole per cent, sometimes in steps of ten.
• Some report only states such as “OK”, “low” or “some remaining” without a number.
• The level is usually the device’s own estimate, worked out from dot or pixel counts and sensors, not a direct measurement of the toner left.
• Some non-genuine cartridges report an unknown level, or report full until they are nearly empty.
• On many models the toner fitted at installation is a starter cartridge with a lower yield than a standard replacement.

Forecasting works well on devices that report percentages. For the rest, fall back to a page-based estimate: pages printed since the last cartridge was fitted against the cartridge’s expected yield. The guide to remote meter reading explains where these values come from.

Why fixed thresholds fail

A percentage trigger treats every machine as if it printed at the same rate. Consider a cartridge rated at 25,000 pages, with a trigger of 20%, which leaves about 5,000 pages.

The quiet office receives a cartridge four months early, and it sits in a cupboard or is fitted early and wasted. The busy team may run out before the courier arrives. Raising the trigger to suit the busy machine makes the quiet one worse; lowering it does the opposite. The answer is to forecast time, not level.

Forecasting days to empty

With a daily level reading for each cartridge, the forecast is straightforward:

Details that make the difference

• Use a window of two to four weeks. Shorter windows react to one busy day; longer windows miss real changes in use.
• Ignore any day where the level went up. That is a cartridge change, and the window should restart from it.
• Count calendar days, including weekends. A machine idle at weekends simply shows a lower daily average, which is correct.
• Watch for seasonal patterns. A school’s usage collapses in the holidays and jumps in the first week of term.
• Forecast each colour separately. On a colour machine, one colour often runs out well before the others.

When to ship: lead time plus buffer

Ship when the forecast days left falls to your delivery lead time plus a safety buffer. The lead time is everything between the decision and the cartridge being in the customer’s hands: picking and packing, courier transit, and the time it takes the customer to receive it internally. For many dealers that is two to four working days.

Add a buffer for forecast error and for the time a cartridge spends in the post room. A total of seven to ten days left at the point of shipping is a sensible starting point. If customers still run out, lengthen it; if cartridges arrive with lots left in the old one, shorten it.

A daily or twice-weekly list of cartridges that will run out within the next few weeks, sorted soonest first, lets the office batch shipments without missing urgent ones.

Avoiding waste and stockpiling

Automatic shipping only saves money if each cartridge is used to the end. Three patterns waste toner:

• Early swapping. The display says “toner low” and someone replaces the cartridge with 10% or more left. Tell customers that low means order, not replace, and that you are already sending one.
• Duplicate orders. The customer orders by email while your automatic shipment is already on its way. Record every shipment against the machine and check before sending.
• Stockpiling. On all-inclusive contracts, cartridges can accumulate in cupboards or leave the building.

Run this reconciliation for every machine once a quarter. It is also the source of your real coverage factors, which feed straight back into your click charges.

A practical routine

1. Each morning, review the list of cartridges forecast to run out within your shipping window.
2. Check each against recent shipments for the same machine and colour.
3. Ship, and record what was sent, when and the tracking number.
4. Let the customer know it is on the way, and to fit it only when the old one is empty.
5. Once a quarter, reconcile cartridges sent against pages printed for every machine.
6. Adjust the buffer if customers ran out or cartridges arrived far too early.

Machines that are not monitored still need a route in. A customer portal where the customer orders toner against the specific machine keeps those orders on the same list, with the same duplicate check. In SubClik’s customer portal, a toner order goes onto the office’s list and the customer can be emailed when it is on its way.

A note on yield figures

Rated yields for laser and toner-based devices are declared under ISO/IEC 19752 for monochrome cartridges and ISO/IEC 19798 for colour cartridges, using standard test pages printed under controlled conditions. They are the right basis for comparing cartridges, and the wrong basis for predicting what a particular customer will get. Use them for your first forecast and replace them with your own measured yields as soon as you have them.