Media support

1. A printer, comprising:

a printing unit;

multiple pallets to support a print media through a print zone near the printing unit, each pallet smaller than the print media;

multiple suction cups in each pallet, each suction cup having a port through which air may be evacuated from the suction cup;

a track to circulate the pallets endlessly through a loading zone in which print media is loaded on to some of the pallets, past the printing unit in a temporary grouping to support the print media through the print zone, and through an unloading zone in which print media is unloaded from the pallets; and

a vacuum source to apply a vacuum to some or all of the suction cups in each pallet in the print zone.

2. The printer of claim 1 , wherein the density of suction cups in each pallet varies between different parts of the pallet.

3. The printer of claim 1 , wherein the suction cups are all the same size and shape.

4. The printer of claim 1 , wherein the density of suction cups in each pallet varies between different parts of the pallet and the suction cups are all the same size and shape.

5. The printer of claim 1 , wherein each suction cup comprises a discrete part embedded in the pallet.

6. The printer of claim 1 , wherein each suction cup comprises an integral part of the pallet.

7. The printer of claim 1 , wherein each suction cup includes a rim surrounding the port, the rim protruding from a face of the pallet.

8. The printer of claim 1 , wherein some of the suction cups arranged in a first part having a first density and some of the suction cups arrange in a second part having a second density less than the first density, each suction cup having the same size and shape as all the other suction cups.

9. The printer of claim 8 , wherein some of the suction cups are arranged in a third part having a third density different from the first density and the second density.

10. The printer of claim 8 , wherein:

each suction cup in the first part is spaced apart from adjacent suction cups a first distance in a first direction and in a second direction perpendicular to the first direction; and

each suction cup in the second part is spaced apart from adjacent suction cups the first distance in the first direction and a second distance greater than the first distance in the second direction.

11. The printer of claim 8 , wherein:

each suction cup in the first part is spaced apart from adjacent suction cups a first distance in a first direction and in a second direction perpendicular to the first direction; and

each suction cup in the second part is spaced apart from adjacent suction cups a second distance greater than the first distance in the first direction and in the second direction.

12. A media support, comprising:

multiple pallets movable through a temporary grouping to form a platen; and

multiple suction cups in each pallet, each suction cup having a port through which air may be evacuated from the suction cup, wherein each suction cup includes a rim surrounding the port, the rim protruding from a face of the pallet at the perimeter of a flexible ring surrounding the port in a space such that the ring may flex into the space away from the face of the pallet when a media supported on the face of the pallet is sucked onto the rim.

13. The media support of claim 12 , wherein each suction cup includes multiple ridges each extending radially out from the port toward the rim.