Homing_override issues

General Discussion
1

Hi,

First of all, thank you for this incredible piece of software — it’s been transformative for my printer setup.

I’m currently running Klipper on a PrintMate3D and have encountered a practical limitation with the homing_override feature. By default, Klipper homes axes in the order X → Y → Z, but due to a clamp on my machine, this sequence can sometimes cause collisions if X homes before Y.

To fix this, I’ve added homing_override to change the sequence to Y → X → Z, which works well for full homing (G28). However, once homing_override is active, all G28 commands — including those targeting only a single axis like G28 X - now trigger the full custom homing sequence. This is problematic, especially if an object is already on the bed and a full re-home could cause a crash.

Suggestion:
It would be incredibly helpful if Klipper could restrict the homing_override block to G28 with no parameters, and fall back to Klipper’s default per-axis homing behaviour when using G28 X, G28 Z, etc.

This would allow safe single-axis homing without losing the ability to define a custom full-homing sequence.

Thanks again for all your hard work and continued support of the community.

Best regards,

2

Definitely changing homing_override is the right approach and by adding a bit of macro code to it like:

[homing_override]
axes: xyz                                            
gcode:
  {% set home_all = 'X' not in params and 'Y' not in params and 'Z' not in params %}

  {% if home_all or 'X' in params %}
    G28 Y # Home Y axis before X
    G28 X
  {% endif %}
  
  {% if 'Y' in params %}
    G28 Y
  {% endif %}
  
  {% if home_all or 'Z' in params %}
    G28 Z
    G1  Z10  # Lift Toolhead after Z Axis Homing
  {% endif %}

I think this will give you what you’re looking for.

Just going through the code:

  • If you just want to home the X axis - it will do the Y axis first.
  • Note that for the Y axis if statement, I don’t check for home_all because if all axes are to be homed then Y was already homed before X and there’s no reason to do it again
  • Nothing unusual about the Z axis, except I always like to move the toolhead up a few mm to make sure there’s no chance of a collision with the print surface.

Obviously, this is untested on your printer, hopefully it will do what you’re looking for.

Let us know how it works out.

3

That seems to solve my problem. Thanks a lot. :slight_smile:

1 Like
4

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