Last night I designed an object for printing using Rhino 5. At the end of the job, I saved the drawing as an stl file and closed Rhino. After some further thought about the object today, I decided that I needed to make a minor alteration to the drawing. However the only thing I've got is the finished drawing. I tried loading the stl file, then saving as a .3dm file, then loading the 3dm file to make the alteration, but that did not resolve the problem. Now I'll just have to accept what I have (I don't want to waste time redrawing the whole thing) and hope that the raft layers in the printing will do what I wanted to do.

The situation leads me to pose this question:

When engaged in a project where objects are being created from an idea, what are the steps one should always take to establish a "fall-back position". In other words, what are the tasks involved in meeting the need for Disaster Recovery in the project?

Old Man Emu