@dc42
Ok it works now not sure what I did wrong before, many thanks anyway!
By the way I had the surprise to see that
M669 S10
also modify segment length. It returns;
"Kinematics is Cartesian, 10 segments/sec, min. segment length 0.20mm, modified matrix:"
without any T parameter.
All good for me thank you for your support.
Alexis
PS: didn't find where to mark this conversation solved.