Hi Graham,
thanks for the quick reply!!
The Geckos have plenty of "air" and the power connection is good and checked. If it was "air" for geckos I would have the same problem for x and y axis which do more movements than z!!
I wonder if it is a problem of the breakout board? or is the Gecko faulty?
By the way your code worked excellent thank you once again !
Best regards,
Biz