Carbon electronics is a growing field that spans printable electronics, energy storage devices, and bio-sensors. The commercialization of these carbon-based technologies requires a scalable production of high conductivity, acid-free carbon nanotube ink dispersions. Super acids have been used to achieve high concentration CNT inks however a scalable acid-free process to achieve similar concentrations has been missing for a long time. In this work, we demonstrate that water and sodium-cellulose are sufficient for achieving a scalable production of highly conductive CNT based ink, provided the solution is processed through a very high shear microfluidizer. Materials used in this process are acid-free and require no post-processing, such as centrifuging or heating. We have achieved conductivity and sheet resistance of 3.6±0.2x105 S.m-1 and 0.11 Ω.□-1mil-1 respectively, which are among the best-reported values for any un-doped carbon-based film. The thermal conductivity of the free-standing carbon films is 43±4 W m-1K-1. Using this method uniformly dispersed CNT inks, of viscosity >1Pa-s, are produced. Once printed on paper, these CNT films show pronounced resilience to mechanical deformation. This simple but scalable process provides a viable technology for using carbon-based conducting inks for printing large-scale devices.