Print carriage,printer comprising such print carriage and relevant method

A system and method for depositing a substance onto a continuously moving substrate in first and second transverse swathes, is achieved by providing a print carriage having a first set of inkjet heads and a second set of inkjet heads. The carriage is traversed across the substrate in a forward pass, while depositing the first and second swathes from the respective first and second plurality of inkjet heads and subsequently traversed across the substrate in a reverse pass. The first and second sets of inkjet heads are arranged such that the first and second swathes complement one another on both forward and reverse passes to provide substantially complete coverage of the substrate. In this manner complementary swathes may be deposited from a single head.