Prusaslicer M107 start code disabling thermostatic extruder fan?
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Duet 3, RRF 3.01 RC10
Moving over to Prusaslicer from Cura and my functioning start gcode is misbehaving weirdly.
I can slice the same part and the Cura gcode works as intended, with thermostatic fan turning as the firmware commands at 45c. With the same start gcode, the Prusaslicer file somehow lets the hotend heat all the way up without the fan on.
The only significant difference (that I can see) in the .gcode files between the two is that Prusaslicer inserts a M107 at the very beginning (before the actual user-start gcode). Cura has the same M107, but it's inserted after the start gcode.
Hotend fan config.g
M950 F0 C"out4" Q16000 ; create fan 0 on pin out4 and set its frequency M106 P0 S1 H1 T45 ; set fan 0 name and value. Thermostatic control is turned onPrusaslicer
M107 T0 M190 S60 ; wait for bed temp M104 S210 ; set extruder temp M109 S210 ; wait for extruder temp M82 ;absolute extrusion G28 ;Home G29 S1 ; load mesh G1 Y5 ; move to front edge G1 Z0.28 F100 ; nozzle to extrusion height G1 E5 ; make a little blob G1 X150.0 E15 F500.0 ; purge line G92 E0 ; zero extruder G1 Z1 G21 ; set units to millimeters G90 ; use absolute coordinates M82 ; use absolute distances for extrusion G92 E0Cura
T0 M190 S60 M104 S210 M109 S210 M82 ;absolute extrusion mode G28 ;Home G29 S1 ; load mesh G1 Y5 ; move to front edge G1 Z0.28 F100 ; nozzle to extrusion height G1 E5 ; make a little blob G1 X150.0 E15 F500.0 ; purge line G92 E0 ; zero extruder G1 Z1 G1 F3000 E-0.8 ;LAYER_COUNT:100 ;LAYER:0 M107 ;MESH:20mm_cube.stlThe weird catch is that I removed the M107 from the Prusaslicer file and it worked as intended, with the hotend fan turning on at 45c during the M109 S210 command.
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Do you select T0 at the bottom of your config.g?
Perhaps it has something to do with M107 being called prior to T0 being called.
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I don't, but I can put it in there.
Interestingly, while swapping the fan numbers seems to have solved the problem on the file start,
I lied, it's not fixed. Apparently it's an intermittent problem which is just lovely.I just finished a test print and the M107 that Prusaslicer sticks at the end of the file (before the user end gcode) will still kill the extruder fan before it's below the threshold.
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@hypnolobster You seem to be getting confused about hot end heat sink cooling fans and part cooling fans. By default, the part cooling fan is fan 0 but you can change to different fan in the tool definition. https://duet3d.dozuki.com/Wiki/Gcode#Section_M563_Define_or_remove_a_tool
If you think about it, part cooling fans cannot be set to thermostatic control because it makes no sense to alter the fan behaviour based on what the hot heater is doing. You want to vary the fan speed depending on what feature of the object is being printed. So slicers insert M106 Snn commands in the gcode file (or M107 to turn the fan off). By default, these commands will apply to fan 0 unless, as I said before, you tell the firmware to use a different fan when you define the tool.
Heat sink cooling fans on the other hand, benefit from being controlled thermostatically and in which case, these are associated with heaters. So by default, fan 1 is usually assigned to the hot end heater which is heater 1.
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Yeah. I went through various fan changes and they were assigned oddly (but functioning, for months).
I just changed them back to part cooling on 0 and the hotend on 1.
I thought that fixed the weird behavior but it doesn't seem like it actually did.For reference, this is the entirety of my config.g
; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Sk-Go" ; set printer name M667 S1 ; select CoreXY mode ; Network M552 P0.0.0.0 S1 ; enable network and acquire dynamic address via DHCP M586 P0 S1 ; enable HTTP M586 P1 S0 ; disable FTP M586 P2 S0 ; disable Telnet ; Drives M569 P0.0 S1 ; physical drive 0.0 goes forwards M569 P0.1 S1 ; physical drive 0.1 goes forwards M569 P0.2 S0 ; physical drive 0.2 goes forwards M569 P0.3 S1 ; physical drive 0.3 goes forwards M584 X0.0 Y0.1 Z0.2 E0.3 ; set drive mapping M350 X16 Y16 Z8 E16 I1 ; configure microstepping with interpolation M92 X200.00 Y200.00 Z800.00 E409.00 ; set steps per mm M566 X700.00 Y700.00 Z60.00 E2500.00 ; set jerk (mm/min) M203 X12000.00 Y12000.00 Z900.00 E3600.00 ; set max speed (mm/min) M201 X1200.00 Y1200.00 Z140.00 E2500.00 ; set acceleration (mm/s^2) M906 X800 Y800 Z800 E600 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout M572 D0 S0.06 ; set pressure advance (0.085 formerly for PLA, 0.4 nozzle) ;M593 F40 ; cancel ringing at xHz ; Axis Limits M208 X0 Y0 Z0 S1 ; set axis min M208 X305 Y300 Z300 S0 ; set axis max ; Endstops M574 X1 S3 ; configure sensorless endstop for low end on X M574 Y1 S3 ; configure sensorless endstop for low end on Y M574 Z1 S2 ; configure Z-probe endstop for low end on Z ; Z-Probe M950 S0 C"io7.out" ; create servo pin 0 for BLTouch M558 P9 C"io7.in" H5 F120 T9000 ; Z probe type to bltouch and the dive height + speeds G31 P500 X31 Y10 Z2.28 ; z probe trigger M557 X31:280 Y15:290 P6 ; define mesh grid M376 H5 ; taper compensation over 5mm ; Bed Heater M308 S0 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp1 M950 H0 C"out1" T0 ; create bed heater output on out1 and map it to sensor 0 M143 H0 S120 ; set temperature limit for heater 0 to 120C M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M307 H0 A115.0 C276.6 D1.5 V23.8 B0 ; autotune result feb 28, 2020 ;Extruder Heater M308 S1 P"temp2" Y"thermistor" T500000 B4723 C1.196220e-7 ; configure sensor 1 as thermistor on pin temp2 M950 H1 C"out2" T1 ; create nozzle heater output on out2 and map it to sensor 1 M143 H1 S320 ; set temperature limit for heater 1 to 320C M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit M307 H1 A422.5 C138.4 D4.4 V23.8 B0 ; autotune result april 11, 2020 ; Extruder/Hotend Fan M950 F1 C"out4" Q16000 ; create fan 1 on pin out4 and set its frequency M106 P1 S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on ;Partcooling/Tool Fan M950 F0 C"out9" Q25000 ; create fan 0 on pin out9 (servo/laser/pwm) and set its frequency M106 P0 S0 H-1 X0.35 B0.1 ; set fan 0 name and value. Thermostatic control is turned off ; Tools M563 P0 D0 H1 F1 S"BMG-M Mosquito" ; define tool 0 G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C ; Miscellaneous M501 ; load saved parameters from non-volatile memory T0 -
Hah, yeah I think I was defining F1 on T0 and it was letting M106/M107 kill the thermostatic fan. I did have the hotend fan on F1, and the way cura sets up its files was apparently allowing that to work.
I think it's actually fixed now.
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@hypnolobster Yes, this is the line that was screwing things up....
M563 P0 D0 H1 F1 S"BMG-M Mosquito"
You defined fan 0 correctly to be the non thermostatic part cooling fan but then you effectively "mapped" fan 1 to fan 0 in that M563. So the firmware "thought" that fan 0 was both a non-thermostatic part cooling fan but also a thermostatically controlled heat sink fan. So no wonder you had strange things happening.
You could either take the "F1" out of that M563 or replace "F1" with "F0" or swap F1 and F0 in both the M950 commands and leave the F1 in that M563. The latter would mean that fan1 is the part cooling fan and fan 0 is the hot end fan but that's a bit "hybrid" and doesn't achieve anything.
In future, one way to remember is that non-thermostatic part cooling fans are associated with tools, but the thermostatic hot end cooling fans are associated with heaters (and heaters are assigned to tools).
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@deckingman it's now Sept 22 and I just had the exact same problem. Thanks for posting this...
Could we ask for an update to the Gcode wiki page for M563 to maybe go from:
Fnnn Fan(s) to map fan 0 to (RepRapFirmware 1.16 and later)
to
Fnnn Part Cooling Fan(s) to map as fan 0 (RepRapFirmware 1.16 and later)
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The documentation page about connecting and configuring fans recommends that you use Fan 0 for the print cooling fan and Fan 1 for the thermostatic hot end fan, precisely to avoid this type of problem. I wish more users would read it.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
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@dc42 Really - I did read it and did set the fans up that way. The issue was not understanding which fan to use in the M563 command. I thought it would naturally be asking for the extruder fan there and "mapping as fan 0" in the doc didn't mean anything to me.
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@markz
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fansOur intention is that in a 3D printer with a single print head, you use the Fan0 output for the print cooling fan and the Fan1 output for the heatsink fan. This is the easiest configuration to use because it's what the firmware expects by default.
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@markz said in Prusaslicer M107 start code disabling thermostatic extruder fan?:
@dc42 Really - I did read it and did set the fans up that way. The issue was not understanding which fan to use in the M563 command. I thought it would naturally be asking for the extruder fan there and "mapping as fan 0" in the doc didn't mean anything to me.
If you have only one print cooling fan and it is Fan 0 as recommended, then you don't need to use the F parameter in the M563 command. That parameter is only needed if different tools use different print cooling fans.
