Enhancement request - Adjustable extruder 'jerk' setting?

RGN01

Hi, I have recently acquired a set of the very neat little Zesty Nimble extruders. https://zesty.tech/ They work great but need a low 'jerk' setting to get good retractions. It seems that there is no easy way to do this in the Repetier firmware so please could this be added as an enhancement request for the next version?

Alternatively, if it is possible to do it in the current version please let me know how.

More info here http://zestytechnology.readthedocs.io/en/latest/nimble_single/tuning.html ;

Thanks.

Richard

RGN01

Sorry, I should have been clearer - they need the low jerk setting for the extruders only, not other steppers.

Richard

zesty_brian

Hi,

Nimble co-creator here, feel free to let me know if there are any questions.

basically due to the gearing inside the Nimble if you have a high jerk on your extruder stepper a retraction will stall the stepper, setting this to a low amount makes everything work fine, it would be great if this could become a user configurable value.

Thanks
Brian

Repetier

Extruder start speed is equivalent to extruder jerk, so reduce that value.

RGN01

Fantastic, thank you!

Is that a 1:1 relationship? By that I mean is 1mm/s Start Speed = 1mm/sec jerk or is there some other ratio involved?

Thanks.

Richard

Repetier

Yes. At start e speed is 0 and with start speed 1 it allows 1mm/s from the start and that is jerk.

RGN01

Thanks again - very useful!

Richard