Delta + RAMPS: shifting layers, loosing steps (1 reply)

Hi there,

we recently moved from Marlin to Repetier for our Kossel Mini driven by a RAMPS 1.4 board. Everything seems to work fine, the nasty speed deviations we had with Marlin have vanished (see [1] for details).

However, it now appears that we are loosing steps (see attached image for failed prints) and I don't know the reason. First I thought the head hits the print but it seems that steps are lost without influence of force (indicators: bed plate was not displaced, I raised DELTA_SEGMENTS_PER_SECOND_MOVE and turned on lift-z-on-retraction as test). The stepper currents never have been a problem as Marlin did not loose any steps. The frequency and acceleration settings should not be unusual.
We also noticed that discrete vertical test structures become slightly oblique which also could indicate a loss of steps.

Could someone please look through our configuration file attached and tell if there are some unfortunate settings? I don't know the quadstepping feature well, maybe there is something screwed?

[1] [forums.reprap.org]