Dual speed Z homing?

  • In the reprap configurator, x,y has two homing speed setting, for first pass (fast) and for second pass (accurate).

    Is there a similar thing for Z homing. I am using BLTouch with probing speed of 2mm/s but if the bed is at the bottom and need to travel 300mm up to get to the head, this is very slow.

  • you can modify your homeall.g

    whats your max speed for Z?

    you can for example put in a higher speed. measure Z once then set the original speed back move down by 5 mm and do the original probing.

  • Yes you can achieve this by setting the desired speed before you do the probe move.

    For instance, you can use M558 in config.g to set the speed you'd like to use for your default probe speed for things like G29.

    Then you can use a seperate M558 command to set a different speed before issuing your G30. Either in bed.g (G32) or your homing macros (G28)

    For example, in my Z homing section I have:

    ; Probe the bed
    M558 A1 F400 ; Set single probing at faster feed rate
    G30 ; Do a single probe to quickly home Z axis
    M558 A10 F100	 ; Set multi probing at slower feed rate
    G30 ; Probe again to get a more accurate position

  • whats your max speed for Z?

    30mm/s but this speed is not used for the z homing.

  • Thanks @phaedrux, I will give it a try.

    This requires manual editing of the sys file(s), right? No more RepRap configurator and such.

  • That's right. You'll have to get into the actual macro files. Make a backup of your base configuration. Check the gcode wiki for details on what the commands do. It's very powerful and flexible.

Log in to reply