An ink stick having a solid ink stick body adapted for insertion in an insertion direction into an ink loader of a phase change ink device. The solid ink stick body includes a top and bottom surface that are oriented substantially perpendicular to the insertion direction and a plurality of side surfaces that are substantially parallel to the insertion direction. The plurality of side surfaces define a plurality of corner edges that extend from the top surface to the bottom surface where adjacent side surfaces meet. A corner guide element extends at least partially along at least one corner edge in a feed direction of the feed channel. The corner guide elements are configured to engage guide members in the feed channel to restrain movement of the ink stick body in at least one direction other than the feed direction. The insertion direction is parallel to the feed direction.