Homing problems

Phaedrux

I may not understand your comment correctly, but homed height would only be saved if you run a delta calibration and then send M500 to save it to config-override.g.

Nothing will get saved after just sending G30. That will only be applied for the current power on cycle.

JoergS5

@capmjk you will not be able to store the Z position between reboots, because when stepper are turned off, they change position by +- 2 full steps each in worst case. It's necessary to measure Z0 position every time after power on and let set the firmware the stepper position.

Another point because you said mesh compensation is not correct: G31 is set to have 0 offset for X and Y, is this correct? Is your probe at the same XY position like the nozzle?

CapMJK

@joergs5 yes. My current probe is manually attached but centered directly below the nozzle.

i know that the current z-pos cannot be saved but before i made your change with the endstops even the homed height was gone after every power off. That is working now

@Phaedrux since i corrected the endstop position to be top side z height is not even saved within a power cycle. As an example: I moved the printer to z=0 after homing and it was 20mm above the bed. So i put g92 z25 -> moved it down until it was the correct height, put g92 z0 in, then M500 and homed. But after the homing z0 was again 20mm above the bed. So even in the power cycle it did not remember the new z0 height and instead set the original homed height after homing.

Phaedrux

@capmjk said in Homing problems:

moved it down until it was the correct height, put g92 z0 in, then M500 and homed. But after the homing z0 was again 20mm above the bed. So even in the power cycle it did not remember the new z0 height and instead set the original homed height after homing.

That's not how homed height is saved. You must do a delta auto calibration and then save it with M500.

https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

CapMJK

@phaedrux i know that now. It worked though because my endstops were wrongfully configured as low end for the last year. Don't ask me though WHY it worked that way.

By the way: Its all working properly now. Thanks alot all of you!

I will be back in time probably since i am currently installing my new Duet 3 into my second printer.