ABL Servo probe bumps into bed before raising to next location

[adamfilip]

During ABL my Z endstop arm on the servo prob bumps into the bed, between retraction and moving to the next location to prob
i removed the servo delay to reduce jitter.

anyway i can tell it to raise 10mm first and then retract the probe
or not retract at all until the last point is done?

[sniffle]

i saw where they added the option to not retract the probe but i need to look into it to get the actual command

[sniffle]

you need the latest version of Marlin, to do this or at least a version since mid january, and use "G29 E"

this comes from the Commit on github
G29 E command engages the servo on first probing point, probes all points and retracts the servo after probing the last point.

[adamfilip]

Thanks G29 E removed a bunch of bumps!
I still get a bump during homing
and when Probing is done it tried to retract once done and it hits

[pichuete]

did you tyied increasing the value under #define Z_RAISE_BEFORE_HOMING . does it bumps beacause the Extruder is to low?

[adamfilip]

using the itty bitty, the servo bracket arm is short and its close to the extruders
if i changed the design of the arm and the servo bracket i could prob adjust the poistion so if wouldnt bump during the rotation.

Raising before homing doesnt help
as its happening at the end
afterit homes and hits the Z endstop
its the last move before i send it a ABL G29 E command

[sniffle]

check the cooling for the E3D i posted recently there is an extended foot in there if you need it

[AbuMaia]

Adam, you need the #define Z_RAISE_BETWEEN_PROBINGS setting I think. If I remember right, that's the one that gets called at the end of homing and ABL to lift it so the switch doesn't scrape the bed.

Also check this thread: http://3dprintboard.com/showthread.p...ed-G29-command

It also raises the Z-Probe prior to retracting it at the end of measurements.

[adamfilip]

I do have raise between Probings already set
but right now, it tried to retract before doing any Z moves.
and it should be the other way around.

I will read more about that thread link, lots of interesting items talked about

[Roxy]

I do have raise between Probings already set
but right now, it tried to retract before doing any Z moves.
and it should be the other way around.

I wonder if you are looking at it wrong? The G28 and G29 are separate commands and not used in the normal operation of the printer. If the printer is not probing, any movement of the Z-Axis should be done with the probe retracted. For G28 and G29 an exception has to be made and the probe is put down. But at the start and at the end of each of these commands the Z-Probe should be retracted. Right?