Set the slicer feed rates to almost absurd values, like 1 and 2 Then the result in the generated gcode is between acceptable ranges. If this work, I will try to modify the firmware feedrate calculation simplifying the formula and splitting it in more parts.
As I have finished the test cycles I will post an update anyway.
Now setting these low values the printer moves. Not fine because the values are too low in some cases but the problem on the z-axis occurs only when there is normal feedrates set in the slic3r with the Repetier host (take in account that I have saved the various kind of slic3r settings.
Exploring the firmware Medel_main.cpp it seems that for some strange reason the feedrate forumla
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Hope you can suggest something else...
Thank you. Enrico
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