Fans are preventing hot end from getting up to temperature
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@jens55 the board im using is a duet 3 6ch and the heater for the hot end is on out 1
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@jens55 as for dropping the the supply from 24v to 12v idk.
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@jens55 heres my config should have started with posting it
; Configuration file for Duet 3 MB 6HC "Duet_TC_Test_Bed(firmware version 3.3)
; executed by the firmware on start-up
;
;M501
; General preferences
G21 ; Work in millimetres
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M575 P1 B57600 S1 ;Buad Rate
G4 P500; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S0 ; physical drive 0.1 goes backwards
M569 P0.2 S1 ; physical drive 0.2 goes forwards
M569 P0.3 S1 ; physical drive 0.3 goes forwards
M569 P0.4 S1 ; physical drive 0.4 goes forwards
M569 P0.5 S0 ; physical drive 0.4 goes backwards
M584 X0.0 Y0.1 Z0.2:0.4 E0.3 C0.5 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M350 C16 I1
M92 X80.00 Y80.00 Z800.00 C100 E93.02 ; set steps per mm
M566 X400.00 Y400.00 Z20.00 C2 E200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X35000.00 Y35000.00 Z1200.00 C5000 E5000.00 ; set maximum speeds (mm/min)
M201 X6000.00 Y6000.00 Z500.00 C500 E2500.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 C400 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S120 ; Set idle timeout
M915 P0.5 S3 F1 H400 R0 ; Coupler, stall settings
;M915 P0.0:0.1 S3 F0 H400 R0 ; X / Y Axes, stall settings; Axis Limits
M208 X0 Y0 Z0 C0 S1 ; set axis minima
M208 X350 Y350 Z400 C500 S0 ; set axis maxima; Endstops
M574 X1 S1 P"io0.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io0.in
M574 Y1 S1 P"io3.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io3.in
;M574 Z1 S1 P"io4.in" ; configure Z-probe endstop for low end on Z
M574 C1 S3; Z-Probe
;M950 S0 C"io4.out" ; create servo pin 0 for BLTouch
M558 P8 C"io4.in" H3 F360 T20000 ; set Z probe type to bltouch and the dive height + speeds
;M558 H10 ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
G31 P200 Z1 ; set Z probe trigger value, offset and trigger height wih gauge block
M557 X15:320 Y15:320 S16:15 ; define mesh gridM308 S0 P"temp2" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp2
M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 R0.178 C617.5 D7.09 S1.00 V23.7 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S110 ; set temperature limit for heater 0 to 110C
M308 S1 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp0
M950 H1 C"out1" T01 ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 R1.878 C174.6 D6.94 S1.00 V23.8
;M307 H1 B0 R2.620 C123.6:122.4 D4.21 S1.00 V23.8 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S300 ; set temperature limit for heater 1 to 260C; Fans
M950 F0 C"out7" Q500 ; create fan 0 on pin out7 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out8" Q500 ; create fan 1 on pin out8 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on; Tools
M563 P1 D0 H1 F0 ; define tool 0
G10 P1 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P1 R0 S0 ; set initial tool 0 active and standby temperatures to 0C; Custom settings are not defined
; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
T0 ; select first tool -
@jens55 I've been tweaking the m307 non stop so the notes aren't up to date
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@ajdriscod I am symbolically waiving the white flag. I have no idea what is going on. Somebody better than me needs to jump in.
I did have a look-see and I don't see a way of setting the heater voltage to 12V.
Any additional tests I could suggest are much more invasive. One thing, if you have an ohm meter, would be to disconnect the heater power at the board and measure the resistance across the two wires.
Another thing would be to hook up a volt meter across the heater terminals while the heater is actually connected (watch out that you don't short anything) and observe the voltage you see across the terminals as the heater is heating up. You should see 24V and once you reach the set point you should see maybe 15 to 20V.BTW, 30 W is rather marginal but it should still be sufficient for tuning .....
Good luck!
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@jens55 No worries. Hey thanks for spending the time to help me out I really appreciate it, I'll keep tinkering.
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@ajdriscod I think you have assembled your hotend wrong looking at the picture. Your heater block is too high and your heatsink fan is nearly touching it!
That will mean the hesink fan will be cooling your heater block which is not what you want.I recommend reading through the assembly guides from e3d on the v6 hotend again in case there are any other issues
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@engikeneer im not above a bonehead move like that i'll take another look i have a bunch of these guys that i haven't assembled yet so i'll try one of those
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It did look kinda odd but I didn't really clue in. I also don't know how one can assemble the thing the wrong way ... but yeah, that would do it .....
Looking at the E3D site, their fan shroud seems to be a bit shorter and so it doesn't go as low. Maybe it droops so much that there is a clear air path below the heatsink fins and down to the hot block? The E3D picture clearly shows that the bottom heatsink fin is below the shroud so it blocks air flow from the hot end fan from reaching the hot block.
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@engikeneer @jens55 I rebuilt the hot end and replaced the droopy fan mount I'm running a tune now and everything seems to be going smoothly. Thanks for all your help!
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