Waiting for Chamber Temperature

U1 Toolchanger
1

In the slicer, there is the possibility to enter a chamber temperature in the filament/cooling section. In the gcode this gives “M191 S40 ; set chamber_temperature and wait for it to be reached” (40 is the temp here).
I know there is no active heating, but I would expect that the printer should be waiting until the temp is reached. But it isn’t the case. Is this not implemented or should I change some settings?

2

I expect it’s not implemented.

3

I did some digging in the printer.cfg file. I found this:

temperature_sensor cavity

sensor_type: NTC_100K_3950_PRECISE
sensor_pin: PC0
min_temp: -273.15
max_temp: 999
gcode_id: C

Does any one know what “gcode_id: C” means?

4

I assume there is no thermocouple for this function as it has no chamber heater.

You could simply wait for x seconds after heating the bed. For example:
M190 S60
G4 S3600

5

My reading of the Klipper documentation is that this is the identifier used to reference this particular sensor (ie “sensor C”).

6

Actually, the meaning of the gcode M191 is to wait for the given temperature to be reached. It doesn’t assume that there is a heater to be put on. So, there is no reason not to implement it in the firmware. I will issue a feature request for this.

Right now, I pause the printing while it is waiting for the bed to reach its temperature and release it when the chamber is at the right temperature. The time elapsed may vary a lot.

7

You are probably right. I was wondering, because the term “gcode_id” doesn’t appear anywhere else in the printer.cfg file.

8

Do you see the chamber temperature anywhere in the machine interface?

9

Fluidd shows the chamber temp & it changes so it’s being read

10

As Gramps-Too stated : it is alive in fluidd.

11

Interesting. Thanks for answering.
May open a ticket and suggest the firmware change?
https://snapmaker.formcrafts.com/u1-troubleshooting-request

12

You might persuade Paxx to add it to the extended firmware.

13

I will open a request for firmware feature. Is the link you gave the way to do it?

14

I will first try the official route. I want to avoid possible double work.

15

This is a U1 specific link, but a troubleshooting one not a request.
Request should exist elsewhere but I think it’s ok..

16

We have 3 threads on this now.

17

Maybe the mods could combine them.

18

This is an easy klipper script, I use this for my U1 but not automated in a print start macro, just a single button push to start heatsoaking

[gcode_macro heat_chamber]
gcode:
    G28

    M140 S110
    M104 T0 S150
    M104 T1 S150
    M104 T2 S150
    M104 T3 S150
    # SET_FAN_SPEED FAN=cavity_fan SPEED=0.3
    G90
    G0 Z50

Here’s what I have for my Voron 2 which has bed fans for air circulation but likely needs modifications for newer Klipper firmware and different hardware:

[gcode_macro HEATSOAK]
gcode: 
    MAYBE_HOME
    SET_DISPLAY_TEXT MSG="Heating chamber: {params.CHAMBER|string}c"

    G90
    G0 X150 Y150 Z130 F3600
    
    {% if printer.extruder.temperature < 150 %}
        SET_HEATER_TEMPERATURE HEATER=extruder TARGET=150
    {% endif %}

    {% if printer.heater_bed.temperature < 120 %}
        SET_HEATER_TEMPERATURE HEATER=heater_bed TARGET={params.BED}
    {% endif %}

    SET_FAN_SPEED FAN=BedFans SPEED={1.0}
    TEMPERATURE_WAIT SENSOR=heater_bed TARGET={params.BED} MINIMUM={params.BED}
    TEMPERATURE_WAIT SENSOR='temperature_sensor CHAMBER' TARGET={params.CHAMBER} MINIMUM={params.CHAMBER} MAXIMUM=90 #MAXIMUM={params.CHAMBER|int + 1}

    SET_DISPLAY_TEXT MSG="Chamber at temperature"

V2’s logic to trigger the heatsoak in print_start:

{% if params.CHAMBER is defined %}
      {% if params.CHAMBER|float > 30.0 %}
          {% if params.CHAMBER|float > "temperature_sensor CHAMBER"|float %}
              HEATSOAK CHAMBER={params.CHAMBER} BED={params.BED}
          {% endif %}
      {% endif %}
    {% endif %}

To implement with the U1 you either call the heatsoak macro in the printers slicer (Snorca or Orca) config or modify the print_start macro in the Fluidd interface.

Note: I do use the extended firmware, don’t know if editing macro’s is possible or persistent in stock firmware

19

Awesome macro! Thanks for the script!

It is: If you enable Advanced mode (Settings > Maintenance > Advanced Mode) you can edit config files and save them. They will be overwritten with the next firmware update though, so make sure to have backups.