You have mastered 3D printing and are getting used to 3D design. What's next? Having the possibility of making your own material. In FDM, this means dissolving the plastic in a proper solvent, adding the external material of interest, evaporating the solvent, shredding the plastic composite, and extruding it to form a printable filament using a commercial filament extruder like the FelFil Evo, Filabot, 3Devo, or by building your own filament extruder, like the Lyman Extruder V5. This procedure is not easy, and the commercially available filament extruders are more expensive than a 3D printer because of the smaller market segment. However, you will have the possibility of making your own composite or multimaterial and printing in any shape you want, a thing impossible even to imagine only a decade ago. But why would you want to make your composite materials for 3D printing? One of the main fields that has taken advantage of this process is the pharmaceutical field, using specific formulations and 3D printing personalized tablets with tailored drug release profiles (Figure ). Studies have also been done to check the printability of composite pharmaceutical filaments. In medicine, composite 3D printable materials are being developed mostly for antimicrobial and medical-grade materials for casts, prostheses, and objects that will be in contact with organs. The possibility of inserting external chemicals in the 3D printing filament gives us the power to print augmented objects. This can be done for mechanical properties, for example, by using natural fillers, even hemp, to modify the printed object's mechanical properties. Metals, wood, and graphite have also been used to change the mechanical properties of 3D printed objects. But probably the most extreme case of this approach for mechanical properties is the embedding of a continuous fiber during the extrusion process. In this case, a continuous thread is inserted and driven inside the nozzle while it deposits the molten plastic so that the continuous thread is embedded in each deposited plastic line, greatly improving the mechanical strength of the final 3D printed part.