Supply reservoir

1. An apparatus, comprising:

a receptacle configured to receive a supply container;

a supply reservoir coupled to the receptacle;

a control panel to display a user interface, wherein the user interface displays:

an indicator of an amount of supply material in the supply container,

an indicator of an amount of supply material in the supply reservoir, and

upon a determination that the supply container is empty of supply material:

an alert to replace the supply container; and

an estimated number of additional pages available to be printed according to an amount of supply material in the supply reservoir before the supply container is replaced; and

print hardware to print the additional pages using the supply material in the supply reservoir prior to replacement of the supply container.

2. The apparatus of claim 1 , wherein the supply material comprises toner powder.

3. The apparatus of claim 1 , wherein the supply material comprises liquid ink.

4. The apparatus of claim 1 , wherein the receptacle is configured to receive a plurality of supply containers.

5. The apparatus of claim 4 , wherein each of the plurality of supply containers is associated with a different color.

6. The apparatus of claim 5 , wherein the user interface displays a separate indicator of the amount of supply material in each of the plurality of supply containers.

7. The apparatus of claim 4 , wherein each of the plurality of supply containers is associated with one of a plurality of supply reservoirs.

8. The apparatus of claim 5 , wherein the user interface displays a separate indicator of the amount of supply material in each of the plurality of supply reservoirs.

9. The apparatus of claim 1 , wherein, upon determining that a new supply container has been inserted into the receptacle, the user interface displays an animation of supply material flowing between the indicator of the amount of supply material in the supply container and the indicator of the amount of supply material in the supply reservoir.

10. The apparatus of claim 1 , wherein the supply reservoir is refilled from the supply container upon a determination that a new supply container has been inserted into the receptacle.

11. A method comprising:

upon a determination that a supply container is empty of supply material, displaying, on a user interface, an approximate amount of a supply material in a supply reservoir that is available for printing additional pages before the supply container is replaced;

printing the additional pages using the supply material in the supply reservoir prior to replacement of the supply container;

receiving, in a receptacle, a new supply container in replacement of the supply container that is empty;

filling the supply reservoir with supply material from the new supply container; and

displaying on the user interface:

an updated approximate amount of the supply material in a supply reservoir, and

an approximate amount of the supply material in the supply container.

12. The method of claim 11 , wherein the approximate amount of the supply material in the supply reservoir is displayed as a count of pages able to be printed with the approximate amount of the supply material in the supply reservoir.

13. The method of claim 11 , wherein the user interface displays the approximate amount of the supply material in each of a plurality of supply reservoirs.

14. The method of claim 13 , wherein a different supply material is associated with each of the plurality of supply reservoirs.

15. A non-transitory machine readable medium storing instructions executable by a processor to:

upon a determination that a supply container is empty of supply material, display, on a user interface, a first indicator indicating an amount of a supply material in a supply reservoir that is available for printing additional pages before the supply container is replaced;

print the additional pages using the supply material in the supply reservoir prior to replacement of the supply container;

receive, in a receptacle, a new supply container;

fill the supply reservoir with supply material from the new supply container; and

display, on the user interface:

an updated first indicator indicating a new approximate amount of the supply material in the supply reservoir,

a second indicator indicating an approximate amount of the supply material in the new supply container, and

an animation of the supply material flowing to the first indicator from the second indicator.