I have trouble getting OPS to work

I have compiled firmware with #define USE_OPS 1
and has eeprom settings as:
OPS operation mode: 2
OPS move after x% retract [%]: 0
OPS min. distance for fil. retraction [mm]: 0.80
OPS retraction length [mm]: 5.00
OPS retraction backlash [mm]: 0.00

But it does never retract anything during moves. Any suggestions?

OPS move after x% retract [%]: 0
never tested this with 0. You always need some retraction to start or the filament will start stringing. So perhaps 20% or so. Maybe that is the reason. Also 5mm retraction is very much. Good hotends need only 1mm and 2-3 should nearly always suffice.

One other point with ops is that the extruder starts with the set max speed - no acceleration. If you hear the extruder loosing steps during retraction lower max speed until you don't hear this any more.

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it worked when changing move after x% retraction > 0.

Good to know. I will look what is the reason and see if i can make it run with 0 or add a condition to prevent this problem.

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