Marlin: Pre-Activating of Z-Axis?

Hello Chaps,

I have some issues with my Z-Axis and I thought maybe it is because of late activation of the axis prior to the useage. I set to deactivate the Z-Axis as long as it is not in use (this is helpful if you want to adjust the height manually at the beginning of a print, which I do all the time). The issue I have is a complete fail of the Z-Axis in the middle of the print. The other Axis work on smoothly - only Z stops. I can't find another way than unplugging the power (electronics are not USB-Powered) from the electronics to reactivate it. After re-attaching the power, everything works fine again...

Therefore I would like to pre-activate the stepper driver a few seconds prior to the z-move. I hope that like this it will perhaps work more smoothly... Is this possible and if yes, how can it be achieved?

Thanks for any suggestions.
Best Regards

Sebastian

some people have issues with z axis drifitng because of vibrations on x axis and z axis disabled.

you could possibly scan the input serial characters for a letter z, then set enable pin for z high. this would mean a z move is entering the buffer, and it will turn on 2-8 moves in advance ahead of buffered commands.

the code change would be in serial.h or something like that...

dear jamesdanielv

I am sure it is not the mentioned drift problem (since I marked my Z-Belt with a sign to see if it mooves at the desired point of the print...).

Thank you for the idea how to implemet this into serial.h.
Since I am not really into programming at all, I would need an already prooved step-by-step how-to to make sure I'll be able to adjust it. I thought that this might be already implemented somewhere (since it was in the old 5D-Firmware...) but if not, I'll try to figure out another way of fixing my issues. Dialed down the Z-Motor driver a little now... tests are running currently.

Regards
Sebastian

perhaps what you want is a delay in timing per pulse?