I started playing with electronics and robotics in 2014. I bought my first 3D printer in 2018. As far as CAD, well, that takes me back into the early 1980's. Programming? I leaned to do that on punch cards back in the 70's. I have been building things all of my life and 3D printing is just another tool that I use. Now that I am retired, this is how I keep my brain active.