So I have been looking at different things of late (3d Printer and software, Electronic Circuit design, DIY PCBs, CNC, etc) and some of the free stuff (my favorite price) keeps coming back to Autodesk software (who would of thought that 30 years ago when dos version of AutoCAD cost more that my yearly salary). The other part that makes me feel old is the series is called 123D. I keep thinking of Lotus 123 instead of Autodesk software (which they also host Instructables) like TinkerCad, 123d Design, 123D Circuit, 123D Catch, 123D Make, 123D Sculpt+, Meshmixer, Sandbox. So strange how things have changed. Btw, I don't work for Autodesk or have stock in them or anything related to them besides using AutoCAD at work. I am just a poor state work that works at Rowan University in Glassboro NJ.
Rick R.