This paper reviews major research into the use of graphene and other monolayer materials in 2D printing technologies for fabricating modern electronics and photonics devices. The paper discusses methods for preparing suspensions, properties of printed layers, examples and parameters of specific printed devices, and major trends in the field. Special emphasis is placed on the conceptual change in graphene suspension preparation from using organic liquids to utilizing water-based solutions for delaminating graphite and fabricating liquid ink. The paper also considers the trend towards the use of increasing graphene-rich ink, an approach whereby highly conductive printed layers can be obtained. The expansion of the range of materials employed is also discussed.