Time projection chambers (TPCs) based on the ionization of cryogenic liquids are a prominent tool for neutrino oscillation, neutrinoless double beta decay, and dark matter experiments. Over the past two years I have pursued the development of a novel charge readout sensor providing true 3D imaging of particle interactions in large-scale liquid argon TPCs. The sensor must meet stringent requirements on noise (<600 electron), power (<100 microwatts per channel), and scalability (digital multiplexing of 100,000 channels per square meter), all at cryogenic temperatures. Such a scalable 3D micro-power sensor would enable operation of liquid argon TPCs in high-occupancy environments, such as the near detector site of the Deep Underground Neutrino Experiment (DUNE). I will present my recent mad dash to a successful demonstration of 3D micro-power imaging of particle tracks in liquid argon, and discuss what worked and what didn’t work along the way. I will also discuss the potential impact on upcoming neutrino measurements.