A molding tool is provided for forming solid ink sticks. The molding tool comprises a vessel having at least one sidewall defining a cavity for receiving molten phase change ink material. The molding tool includes a lid for covering an opening over the cavity of the vessel. The lid has an interior surface for at least partially enclosing the cavity. The enclosed cavity has a shape corresponding to at least a portion of an ink stick shape. The at least one sidewall of the vessel and/or the interior surface of the lid are configured to flex to facilitate release of an at least partially solidified ink stick from the cavity.