Is there a way for the config tool to "read" my current config, make my changes and reload new?
I initially used config tool but hv also gone and changes some settings manually so my last known good file is no longer valid for my setup.
Host has no config tool.
If you mean Repetier-Firmware then answer is yes if the original file was also created with the tool.
Now I see it. I looked too quickly. Thanks for your time.
Where do I find my current config file?
It's named configuration.h but I can not say where you saved it. If you downloaded the complete zip it is inside.
I initially used the config tool. I hv since changed that config. Would my current config be saved in my unzipped folder?
You should not change config outside tool. If you upload you only see the settings from last download not later manual changes. Reason is that they are stored in a special comment for the tool. When you download the zip it contains the config file with made settings. For later changes only upload the config file.