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Hello sir
Thank you for your answer, I got to get something with my GRBL, but actually the X axis (by screw) is a little slow and noisy I will rethink my editing and inspire me with your X axis and its trolley door pen, if you allow it.
for Step files with freecad I found a solution with Freecad 0.17
to make a step clone, then after we can add elements and perform boolean operations.
Thanks soon may be