Gels can be formed from low molecular weight gelators (LMWGs). The LMWGs self-assemble into one-dimensional structures that entangle to form a network. Typically, this self-assembly is reversible, meaning that gels formed in this way are typically responsive to environmental stimuli. Such gels can be used in numerous applications including waste management and 3D printing. This chapter covers the self-assembly process and trigger methods capable of initiating this process, LMWG design and some of the potential applications for these versatile systems.