Arbitrary micro-scale three-dimensional (3D) structures fabrication is a dream to achieve many exciting goals that have been persuaded for a long time. Among all these applications, the direct 3D printing to fabricate human organs and integrated photonic circuits are extraordinarily attractive as they can promote the current technology to a new level. Among all the 3D printing methods available, two-photon polymerization (2PP) is very competitive as it is a unique method to achieve sub-micron resolution to make any desired tiny true 3D structures. To achieve it, 2PP relies on the direct laser writing to transfer the pattern into the photoresist material by the two photon absorption to initialize the in-situ polymerization. However, the requirements for the building blocks are different for different purposes. Even though 2PP is of many superior properties, it is often considered as a supporting role to make the initial polymer structural molds or backbones for further processing steps.