HI - I am a retired CNC machine shop owner and my daughter thought that I needed something to do, so, I received a 3D printer for my birthday last week. I hadn't thought that it was something that I really needed, but the more that I've gotten into it - the more I think that maybe I do!
At this point, I have spent most of my time renewing my CAD modeling skills (it's been a while) and I've printed a few sample open source things that I picked up from OnShape's web site. Here is my problem - on my CNC mills I had a "floating zero", that is, I could set my zero point anywhere on the bed of th