David
What I did was make a two separate models of each horizontal and vertical sets of tool paths.
In the horizontal mode the error followed the axis that was the stepover,(the error was in Z though)
if I rotated the tool paths 90 degrees in Z then that axis was ok, Y axis if I remember correctly, in the vertical tool path mode the
error still followed the stepover axis this time it was the X axis. But not both at the same time.
See pic It's the same tool path just looking from front and the side superimposed on each other just rotated 90 deg.
The tool path in one axis is following the model surface (where the Z value is correct) only in the other axis is the Z value to high.
The Z error swaps axes whether doing a horr\vertical mop.
The Z offset from the model surface is incorrect in one axis.
This is what the original pic is showing where you can see more of the model in one axis than the other.
I don't know if it matters but the torus model was a little shorter in one axis than the other, this may have been due to the resolution on the stl.
Yes, this is a problem, don't know if we can do anything about it though, except make people aware.
of the bounds of the stepover and resolution settings when using the horr\vert mops.
What I'm thinking though is that after a few months and many posts later, that the information
here about the settings for resolution and stepover will get lost in the noise.
Dave