I can proudly announce that GCode printr is working on my set up with Repetier/Ramps1.4.
I have to applaud Mathias for his persistence with my problems. I think any other developer would’ve told me to move on to something else but not Mathias.
The problem was completely on my side in my configuration H file.The bug was inside configuration H (feature -checksum -forced false) was set to true.
Thank you for providing all the debug logs and details to be able to narrow down the problem !