Object holder for a direct-to-object printer

A direct-to-object print system for printing on a surface of an object, the direct-to-object print system comprising:

• at least one printhead configured to eject marking material on to a surface of an object;
• a support member positioned to be parallel to a plane formed by the printhead;
• an object holder comprising:
• a shuttle mount configured to slideably traverse the support member;
• and
• a plurality of multi-pointed star-shaped receptacles in the shuttle mount for receiving a retainer in one of a plurality of orientations relative to an edge of the shuttle mount;
• and
• a plurality of removable retainers for collectively retaining the object while it is being moved, each retainer having a head and a base, and each retainer is one head type in a set of two or more different head types with an edge head type shaped to retain a straight edge of the object on the shuttle mount, and a corner head type shaped to retain a corner in which two or more edges of the object meet on the shuttle mount, wherein a base portion of each retainer being shaped such that, when the base of the retainer is pressed into one of the multi-pointed star-shaped receptacles, the head of the retainer assumes a desired orientation;
• and
• a controller configured to cause the printhead to eject marking material onto the object held by the object holder as the object passes the printhead.