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Kipper - Home printer only if needed (self.3dprinting)

submitted 3 months ago* (last edited 3 months ago) by LazaroFilm to c/3dprinting

6 comments fedilink hide all child comments

Homing your printer systematically before a print is redundant, a waste of time and sometimes even an issue (if your homing probe is misbehaving and you’ve already dialed an offset by need to restart the print for a clean first layer for instance) I recently came upon this G28 macro that only homes of the printed is not already homed.

[gcode_macro G28]
# Only home if needed.
rename_existing: G28.1
gcode:
    {% if PA %}
        G28.1 {PA}
    {% else %}
        {% if printer.toolhead.homed_axes != "xyz" %}
            G28.1
        {% endif %}
    {% endif %}

All you have to do is add this to your macro.cfg file and it will override any G28 command from any gcode and only execute a home if needed. If you want to execute a home even if not needed, you can send the command G28.1 or give it a parameter, like G28 X, or G28 XYZ and it will force the homing

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[–] [email protected] 5 points 3 months ago (1 children)

Seems like a more efficient choice but be wary (weary?) that some printers will unlock the motors after sitting for X amount of time without any movement or commands, which will require you to home again anyways.

This seems ideal if you're running prints back to back though.

[–] LazaroFilm 2 points 3 months ago (1 children)

Then if the motors are released the home will activate. No issue there.

[–] [email protected] 3 points 3 months ago (1 children)

Yeah I meant it as more a heads up if someone finds themselves in a scenario like you described where their bed probe is on the fritz and they're hoping to work around that.

[–] LazaroFilm 1 points 3 months ago

Also, this is for Klipper you can change the behavior of your printer to do whatever you want.