CoreXY/Hbot implementation bug?

Hello,

I play with repetier firmware since many time, and before complain about repetier-firmware, I was thinking it's my hardware implementation the problem. And Bashlash problem more than software problem.

So after many consideration about my hardware I have try to print the same file/gcode with only two change:
-Change line #define DRIVE_SYSTEM from 1 to 0
-Divide the step/mm by square(2)

So print have the same size but the corexy system in cartesian mode print with 45°.

The print with CoreXY mode enabled with my coreXY printer where you can see that the distance between infill are not equally distanced at all:


The same printer, same slicer parameter, same firmware parameter (only step/mm) and drive_system changed. Where the distance between infill spacing is almost perfect;


Now the two printed part, the left one in cartesian mode, and the second one in H-gantry mode:

The layer at left are perfectly aligned (cartesian mode), where the right one (smallest tower) have a strange alignement of layer.

It's difficult to taking focused photo to see the imperfection, but I can try more if you want.

Best Regards.
ie: I think Marlin-firmware have the same bug.

I have the same bug (CoreXy custom made), i thought i was my steppingrate from HTD3M.
Yeah marlin has the same bug.

Looks like every 2. layer has another position.

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Edited 1 time(s). Last edit at 06/02/2014 04:56PM by Hux Flux.

@ Hux Flux: Repetier or Marlin for the firmware ?

At the moment Repetier.