Thermostatic Fan no longer functions after print job abort

[adammhaile]

Board: Duet 3 MB6HC (MB6HC)
DSF Version: 3.1.1
Firmware: RepRapFirmware for Duet 3 MB6HC 3.1.1 (2020-05-19b2)

I have a thermostatic controlled fan configured for my hotend which works normally unless I abort a print job. In that case, what happens is:

• The heaters stay on after the job is aborted, which is a little weird to me but not a huge deal.
• I turn the heaters off manually and the hotend will begin to cool while the hotend fan stays on.
• Below 50C, as configured, the hotend fan will turn off
• If a new job is started, however, the hotend fan will NOT turn on at 50C like it's supposed to.

At this point, the only option I've found that works is to fully power cycle the machine.
I've tried all sorts of combinations of commands including re-running the fan setup:
M106 P0 S255 H1 T50
Even running this after the fan has cooled from a job abort will not get it to turn back on.
Basically, once it has cooled and the fan turns off, there's no command I've found that will turn it back on again.

Is it possible it's just mis-configured? I've been pouring over the documents and it looks like it's configured correctly to me.
Or maybe it's an actual bug in the firmware?
I've attached my full config.g for reference. I know it's a little out-dated - I think it was adapted from an old Duet2 config... I did not write it. It's for a machine that is similar to the RailCore II but that was upgraded to a Duet3.

config.g

[qablos]

This post is deleted!

[qablos]

What happens if you just manually turn on the heater above 50 degrees from dwc?

[adammhaile]

@qablos said in Thermostatic Fan no longer functions after print job abort:

What happens if you just manually turn on the heater above 50 degrees from dwc?

I can't from the UI - I only get part cooling fan controls in DWC. Nothing for the heatsink fan. Only option is to issue M106 P0 S0, which will turn off the fan. And if I had canceled a job it will never turn back on again no matter what I do.

[A Former User]

@adammhaile said in Thermostatic Fan no longer functions after print job abort:

I can't from the UI - I only get part cooling fan controls in DWC. Nothing for the heatsink fan

thats normal for a thermostatic controlled fan; there is no manual override unless reconfigured out of thermostatic mode with M106 H-1

[Phaedrux]

How are you aborting the print job? Can you post your cancel.g file?

[qablos]

@adammhaile I meant manually turn on the heater to above 50 degrees - does the fan come on an off when you're not using any macros/gcode files?

[adammhaile]

@Phaedrux said in Thermostatic Fan no longer functions after print job abort:

How are you aborting the print job? Can you post your cancel.g file?

I don't have a cancel.g file
My stop.g file is empty (not sure if that's the same thing)
You can find all my configs here: https://github.com/ManiacalLabs/3DPrinterData/tree/d4753824bfa84177b212049f7c56c2eb2026ae9f/Daedalus/config

@qablos said in Thermostatic Fan no longer functions after print job abort:

@adammhaile I meant manually turn on the heater to above 50 degrees - does the fan come on an off when you're not using any macros/gcode files?

Yes - it will work as expected if I change the hotend temp up until I cancel an in progress print.

[Phaedrux]

What do you have in your slicer start gcode?

M106 P0 S1 H1 T50

Can you try using S1 instead of S255?

[adammhaile]

@Phaedrux said in Thermostatic Fan no longer functions after print job abort:

What do you have in your slicer start gcode?

From PrusaSlicer

M140 S[first_layer_bed_temperature]
M104 S[first_layer_temperature]
G28
M190 S[first_layer_bed_temperature]
M109 S[first_layer_temperature]
G1 X0.0 Y0.0 Z1.0 F1000.0 ; prepare to prime
G92 E0 ; reset extrusion distance
G1 Z0.2 F1000.0
G1 X60.0 E9.0  F1000.0 ; priming
G1 X125.0 E12.5  F1000.0 ; priming
G1 Z0.5 F1000.0
G92 E0 ; reset extrusion distance

S1 vs S255 doesn't make a difference.

[Phaedrux]

Try creating a cancel.g and defining what you want to happen when you cancel the print. (turn off heaters, home x and y, etc) and see if that makes a difference.

[baird1fa]

Do you have the same problem when a print job ends by completion?

[adammhaile]

@baird1fa said in Thermostatic Fan no longer functions after print job abort:

Do you have the same problem when a print job ends by completion?

No - it works fine if it completes normally.

@Phaedrux said in Thermostatic Fan no longer functions after print job abort:

Try creating a cancel.g and defining what you want to happen when you cancel the print. (turn off heaters, home x and y, etc) and see if that makes a difference.

Ok, I'll see if I can come up with something.
Any examples on hand I can draw from?

[baird1fa]

What is in you ending script from the slicer? I had something similar happen with my BLTouch servo pin (PWM) and it turns out that is was caused by the stepper for the direct drive staying active. I had to send an M18 E0:1 command time disable my extruder.

It might be something similar if you have a direct drive or an M18 that is in the ending script of your slicer GCodes.

[adammhaile]

@baird1fa said in Thermostatic Fan no longer functions after print job abort:

What is in you ending script from the slicer? I had something similar happen with my BLTouch servo pin (PWM) and it turns out that is was caused by the stepper for the direct drive staying active. I had to send an M18 E0:1 command time disable my extruder.

It might be something similar if you have a direct drive or an M18 that is in the ending script of your slicer GCodes.

But it's not getting that far - this is only for canceled jobs. The end script never occurs.
Besides it's just:

M106 S0 ; turn off cooling fan
M104 S0 ; turn off hotend
M140 S0; turn off bed
G91 G1 H2 Z3 F6000    ; lift Z relative to current position
G90 G1 X0 Y280; part removal
G91 G1 H2 Z-2 F6000   ; lower Z again
G90               ; absolute positioning

[baird1fa]

When you cancel a job do you pause it first, then cancel? If so the you are calling pause.g then stop.g, so there is no need for cancel.g. But try adding the ending script into stop.g and see if that works.

Except maybe the part removal moves.

[adammhaile]

Ok, we ended up creating a cancel.g file with the same content as the above end script and now it all works fine.

[Phaedrux]

Interesting. The cancel.g file is optional and does not exist by default, so if this was a widespread bug I think we'd have heard about it more by now.

[adammhaile]

@Phaedrux said in Thermostatic Fan no longer functions after print job abort:

Interesting. The cancel.g file is optional and does not exist by default, so if this was a widespread bug I think we'd have heard about it more by now.

Yeah - I don' t know. Maybe something that should/could be tweaked in my config.g
Though, in general I've found the Duet3 to be.... maybe not buggy, but quirky. For example, if you try to adjust baby-steps while it's heating before a print job, the whole thing hangs and will never start printing. Have to power cycle everything. Stuff like that and a few other small thing I just haven't gotten around to posting about

[baird1fa]

@adammhaile that's an interesting not about the babysteps during preheat. I've done that a few times and it hasn't cause me a problem. the bugs must also be linked to specific setups, a perfect storm situation as it were.