Prevent cold homing

3dyorick

Hi,

I would like to prevent my Z axis to home cold
Can i add a condition that the temperature of the nozzle has to be between temperatures without actually changing the setpoint?

fcwilt

@3dyorick said in Prevent cold homing:

I would like to prevent my Z axis to home cold

If you are using v3 firmware you can do that.

JOOC why do you want to do that?

Frederick

3dyorick

so i've to do the update that i planned first.

Problem was that i started the G29 code but a cold blob on my nozzle touched the bed first and the Z kept forcing down.
(BL touch should also fix this but i've not recieved is yet

PCR

put G29 in the startcode after you waited for the nozzle to reach temp?

fcwilt

@3dyorick said in Prevent cold homing:

so i've to do the update that i planned first.

Problem was that i started the G29 code but a cold blob on my nozzle touched the bed first and the Z kept forcing down.
(BL touch should also fix this but i've not recieved is yet

I see. You said "cold homing" but G29 is not used for homing - it is used for creating/loading the height map used with mesh compensation.

When are you using G29?

Frederick

deckingman

@3dyorick Another way of doing it without upgrading or using conditional gcode is add commands to heat the nozzle at the start of your homeZ moves. (That's what I do because I use the nozzle as a probe).

So for example you can have....

T0 ; select tool zero
M104 S140; heat to 140 (use whatever temperature you decide on)
M116 P0 ; wait for it to reach temperature

G1 H1 Z-nnn .....etc

One slight caveat is that if the nozzle is already at say 180 deg C, the above code will wait for the nozzle to cool to 140. So pick an appropriate temperature to sit you usage case. (although it would be unusual to have the hot end heated fully to print temperature before commencing any homing moves).