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

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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.

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