Unlike the first game, you face an opponent during Dice & Cube games who is also trying to race to the end of the course, so you can’t just run around the area forever grabbing reward squares. The best way to make money at the end of the game is by playing Dice & Cube at Paradise VR. So if you managed to run out of club funds you will have to play more matches to obtain more funds. Funds required to build Robotics Parts are obtained from playing Robotics Club matches, not taken from yourself. If you avoid grinding them through matches this can be a bit of a money sink, though not as much as Drone Parts are because Robotics Parts require some unique materials that are only obtained through the Practice Matches, so you will obtain a large number of the other materials along the way. Materials for Robotics Parts can all be obtained either through rewards from Robotics Club matches or purchasing from vendors around Ijincho.
Robotics Parts blueprints are obtained as you progress through the Robotics Club School Stories section. This guide shows how to build all Robotics parts and the locations of the Robotics Materials. In Lost Judgment making all 162 Robotics Parts is required for a TownGo School Mission for the Robotics Club, and therefore counts towards the 100% requirements for TownGo Senior and TownGo Master.