Hi

Having been down this road a *lot* of times:

1) Get a notebook. Label it "i3 Printer"
2) Each time you change something, write down the change in the notebook
3) Each time you put in firmware, write down the version and settings in the notebook.
4) Each time you do a config file, save it in a folder on the computer with the date on it.
5) When you do a setup, note the values you came up with
6) When you cable up a board, note what goes where in the notebook
7) Date the pages at the top so you can figure out what was done when
8) Either keep notebooks by machines or by dates. Machines makes it easier to track down. One book at a time (dates) makes them a bit easier to index. If you do the date approach, mark the top of the page with what you are working on....

Yes it's a bit tedious. Each step takes a few seconds to complete. Once you get into the habit, it really does not add much time to the whole process. It's still not *easy* to figure things out. When I go into a 20 year old notebook, there is a bit of head scratching. More often than not, the info in there is useful in moving forward with a fix.

Bob