Lately all kinds of 3d printers have been made available to the masses. They are great for designing and pretty much building anything.  As long as it is made of polymer you are good to go. What if you want to expand into other materials like aluminum or wood? Well now you have an option, The Nomad 883. It is a Kickstarter campaign that allows your to get a CNC right in your own home.  Pinewood Derby cars will never be the same again.  These machines are made in America so be sure to go support them.  The Nomad 883 – Kickstarter