In osx I replaced the wcb.py installed by the installer (https://github.com/evil-mad/wcb-ink/releases/latest) with the one i downloaded from the github V1 branch in the extension folder (Modified version for printing on AxiDraw) It was the same one that i installed in linux. And wcb.py is located here:/Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions
In osx I also installed them in the user extension folder but it is exactly the same.
Thanks a lot for the new template i still could not open it from linux who knows why but i opened it in osx and there was not a problem. I made a new file with the same size as the template (990x720px scale 1) in Linux and the size of the 10cm cube was very close I got 10.6 cm. Is this small discrepancy because i am missing something from the original template or does it have to do that i have an AxiDraw V3/A3?