Z Babystepping

phcella

Hello,
I'm facing a annoying problem, and I don't know how to solve.
I have a IR Z-probe sensor, and I calibrate the the triggered height on every point. Then I run G32, but sometimes the nozzle is a bit high from bed and I decrease the z baby step, but the nozzle doesn't go down. Why does this happen?

jens55

@phcella, the nozzle can not go below the point you designated as your minimum Z position. Usually that is z=zero. If the nozzle is a bit high though and Z is already set to zero then it can't go lower.
In my config.sys:

; Axis Limits
M208 X-10 Y0 Z-0.5 S1 ; Set axis minima
M208 X530 Y495 Z480 S0 ; Set axis maxima

Note that I allow z to go to -0.5 which allows me to step a bit lower.

Topher

@jens55 said in Z Babystepping:

@phcella, the nozzle can not go below the point you designated as your minimum Z position. Usually that is z=zero. If the nozzle is a bit high though and Z is already set to zero then it can't go lower.
In my config.sys:

; Axis Limits
M208 X-10 Y0 Z-0.5 S1 ; Set axis minima
M208 X530 Y495 Z480 S0 ; Set axis maxima

Note that I allow z to go to -0.5 which allows me to step a bit lower.

^ This is what I do too. Another option you can do while a print is running is to enter M564 S0 in the console before you try to set your baby steps below zero. Record your final baby step value when your first layer is looking good and then add that to your Probe's Z offset so your future prints don't need adjustment.