A homemade CNC machine for cutting PCBs.

Boston Dynamics' robot dog, Spot Mini is unavailable at any price. A Chinese copy is $30,000. Cut 99% of the cost and build one at home.

Say Alexa the move, it is automated using the xy plotter that we have made especially for Chess.

Make an R2-D2 replica and control it by an app you programmed. Add a Nokia interface which gives you the Star Wars characters info.