Smart Preheat (Not so smart)

Plugins
1

Recently the smart preheat plugin broke for me. I have upgraded to python 3, and installed klipper on the printer.
Now when it's "preheating", and i have recently done a print, as in, it's already hot. It WAITS for the bed to cool down to 45c before heating up things again. Which is quite the opposite of what i want this plugin to do. How can i help fix this issue?

2

I have this same issue, I was wondering if you ever found a fix or if anyone could recommend how to do this with IF statements in the Klipper config>?

3

This is a problem with Klipper not conforming to the GCode "standard" for M109/M190.

4

Thanks for that, it was a bit of a deep dark path for that argument but glad to see that the "TEMPERATURE_WAIT" command was implemented to address this... That said, in order to incorporate that for use with Smart Preheat ... At first I was thinking to replace the M190 commands with the Klipper temp wait command, but I'm not sure how to do so and make sure that I'm keeping the variables correct... I don't think I can just go into the Plugin config and "find/replace" "M190 S" with "TEMPERATURE_WAIT" ??? or is it really just that simple??

My thought was to do something like this:
The "default" Smart Preheat statement is"
; Wait for bed to reach 80% of required temp then set to required temp
{% if printer_profile.heatedBed %}
M190 S{{ (plugins.smartpreheat.bed * 0.8)|round }}
M140 S{{ plugins.smartpreheat.bed }}
{% endif %}
[1:19 PM]
My thought was to do something like:
{% if printer_profile.heatedBed %}
TEMPERATURE_WAIT SENSOR=<config_name> MINIMUM={{ (plugins.smartpreheat.bed * 0.8|round }} MAXIMUM={{ plugins.smartpreheat.bed }}
{% endif %}
Thoughts? (where config_name is the Klipper config name of the heated bed temp sensor)

5

I just did this for my machine:

$ cat M190.cfg 
# Workaround for M190 S
[gcode_macro M190]
rename_existing: M190.0
default_parameter_S: off
default_parameter_R: off
variable_tolerance: 1.0
gcode:
    {% if S != 'off' %}
        M140 S{S}
        TEMPERATURE_WAIT SENSOR=heater_bed MINIMUM={S|float - tolerance}
    {% elif R != 'off' %}
        M191 S{R}
    {% else %}
        M140 S0
    {% endif %}
2 Likes
6

I take it you got rid of or don't use the plugin anymore then, just the Klipper Config?

7

I still use the plugin. It shaves heat time off by a few minutes.

1 Like