The firmware doesn't wait for the temperature to drop
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I just tested M109 R80 followed by M117 in a macro, and it did wait for the hot end to cool down (to 82.5C, which it considers near enough). Then I tried M109 R50 followed by M117, and again it waited for the hot end to cool down before displaying the message.
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I found the issue!
M109 RXX works for any number greater than or equal to 40. Any number below 40 doesn't work. In my application, I need to wait for the heater to get to the room temperature. Is there any way I can do that?
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Maybe as a short term workaround, wait until it gets to 40C and then pause for X seconds?
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Maybe as a short term workaround, wait until it gets to 40C and then pause for X seconds?
Thanks, that's what I'm doing now, but that pause doesn't get me back to the same temperature each time. As you said, it's a good short-term workaround.
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I found the issue!
M109 RXX works for any number greater than or equal to 40. Any number below 40 doesn't work. In my application, I need to wait for the heater to get to the room temperature. Is there any way I can do that?
That's right, 40C is considered low enough that it might be close to room temperature in a hot climate and cooling below that might be impossible. But you said you were commanding 50C. The Duet doesn't know what your room temperature is.
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I was commanding a lot of numbers and was confused what was going on. I wrote 50 here as an example because I thought there was something wrong with my setup and the number doesn't actually matter. Anyway, thanks for the replies. I think I need to figure out a workaround for what I want to do.
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I'm encountering a similar problem with tool change
tfree0.g
G10
G91
G1 F5000 Z2
G90
M106 S255
M116tfree1.g
G10
G91
G1 F5000 Z2
G90
M106 S255
M116tpost0.g
M116tpost1.g
M116it doesn't wait fro temp stabilisation, it just goes straight through, i.e. the print doesn't wait on the tool change to sort its temp before restarting
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What active and standby temperatures have you set in your G10 commands?
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Active for both is 190 Standby for both is 170
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Hi, any ideas on this as I want to use for my dual extrusion work?
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My dual extrusion machine is down to single extrusion at present, but I'll try to get the second extruder working again and test it over the weekend.
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Brilliant, thanks
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Hi DC, any update as want to try and move to tool macros but need this to work.
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I'm sorry, I re-installed my send extruder but I didn't get any further than that.
Please can you confirm exactly what problem you are getting on a tool change.
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Hi, yes it may be my interpretation of M116, but I thought that "wait for temperatures to stabilise would mean that on a dual extruder system where you set both extruders to have an active temp of 190 and a standby temp of 170 the firmware would pause during the extruder change for the standby tool to reach 170 and the active to reach 190.
So in my macros (above) issue M116 on tfre would wait for the currently active but soon to be inactive tool to reach 170, then another M116 in the tpre or tpost would wait for the active tool to reach 190 before restarting the print. This is not happening, so although the tools swap, the original tool is still cooling and the new tool starts to print at 170 and the temperature rises to 190.
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Yes, M116 with no parameters should work like that. I'll check it out. However, tfree#.g is called just before the tool is deselected, so the M116 command in your tfree#.g files won't do anything because the old tool is still active at that point.
I normally recommend just M116 P0 in the tpost0.g file and M116 P1 in the tpost1.g file. That way, it waits for the new tool to heat to active temperature, but doesn't wait for the old one to cool down - which takes longer and isn't necessary on most printers. But M116 with no parameters in tpost#.g should work if you want to wait for cool down as well.
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So just to verify, if I add
M116 P1
M116 P0to tpost0
and
M116 P0
M116 P1to tpost1
it should wait for the previous extruder to cool to standby and then wait for the new to heat to active before proceeding?
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Yes, that ought to work.
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Hi DC, tested it from the Machine Control, and sorry to say it doesn't appear to be working, i.e. the 2nd extruder starts to heat at the same time as the first extruder is cooling rather than waiting for the first extruder to cool down first, it does appear like there may be a bug in the code here.
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I have just tested M116 on my dual nozzle machine, and it works as expected. However, I did find a peculiarity. If I send a G10 command to change the active and/or standby temperatures of a tool other than the one that is selected, the new temperatures get stored somewhere, but they are not actioned or displayed in DWC. They only get used and shown in DWC when you select that tool. Would this explain the problem you are having?
