@Phaedrux
@droftarts

I found some settings that really helped it work, but I believe that activating the M208 was the big point, because until then nothing was working, as if the machine didn't have a reference point, all the changes made up until now had already been done before but without realizing that the 208 was disabled. So I would like to contribute with the config.g file as it is and everything works.

; Configuration file for Duet 3 MB 6HC (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.16 on Sat Jun 24 2023 18:49:15 GMT-0300 (Horário Padrão de Brasília)

; General preferences
G90 ; send absolute coordinates...
M83 ; but relative extruder moves
M550 P"UNO Print" ; set printer name

; Wait a moment for the CAN expansion boards to start
G4 S2

; Network
M552 P0.0.0.0 S1 ; enable network and acquire dynamic address via DHCP
M586 P0 S1 ; enable HTTP
M586 P1 S1 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S0 ; 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
M569 P0.4 S0 ; physical drive 0.4 goes forwards
M569 P0.5 S0 ; physical drive 0.5 goes forwards
M584 X0.1 Y0.2:0.3 Z0.4:0.5 E0.0 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X67.00 Y67.00 Z1650.50 E370.00 ; set steps per mm
M566 X300.00 Y300.00 Z15.00 E5500.00 ; set maximum instantaneous speed changes (mm/min)
M203 X3500.00 Y3500.00 Z1100.00 E5500.00 ; set maximum speeds (mm/min)
M201 X300.00 Y300.00 Z180.00 E100.00 ; set accelerations (mm/s^2)
M906 X1680 Y1600 Z1600 E920 I90 ; set motor currents (mA) and motor idle factor in per cent
M84 S75 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X700 Y400 Z400 S0 ; set axis maxima

; Endstops

M574 X1 S1 P"121.io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io0.in
M574 Y1 S1 P"io1.in+io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io1.in+io2.in
M574 Z2 S1 P"io4.in+io5.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io3.in+io4.in
M574 Z1 S2
;M574 X1 S1 P"121.io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io0.in
;M574 Y1 S1 P"io1.in+io2.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io1.in+io2.in
;M574 Z1 S1 P"io3.in+io4.in" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io3.in+io4.in
;M574 Z1 S2 ; configure Z-probe endstop for low end on Z
;M574 Z1 S1 P"io3.in+io4.in" ; configure endstop for high end on Z

; Heaters
M308 S0 P"temp0" Y"pt1000" ; configure sensor 0 as PT1000 on pin temp0
M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"121.temp0" Y"pt1000" ; configure sensor 1 as PT1000 on pin 121.temp0
M950 H1 C"121.out0" T1 ; create nozzle heater output on 121.out0 and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Tools
M563 P0 D0 H1 F0 ; 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

; Fans
M950 F0 C"121.out1" Q500 ; create fan 0 on pin 121.out1 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"121.out2" Q500 ; create fan 1 on pin 121.out2 and set its frequency
M106 P1 S1 H-1 ; set fan 1 value. Thermostatic control is turned off

; Z-Probe
M950 S0 C"121.io0.out" ; Duet 3 MB6HC
M558 P9 C"121.io0.in" H5 F120 T6000 ; Duet 3 MB6HC
G31 P500 Y0 ; set Z probe trigger value, offset and trigger height
G31 P500 X0 Z0.65 ; set Z probe trigger value, offset and trigger height
M557 X125:650 Y50:350 S262.5:150 ; define mesh grid
;M374
;M374 P"HeightMap.csv"
;M375
;M375 P"HeightMap.csv" ; Salva o mapa da grid do autolevel
M376 H10 ; corrige a sobre extrusão na compensaão até 5%

; Custom settings are not defined
M575 P1 S1 B57600
;M572 D0 S0.45 ; definir o avanço de pressão da extrusora 0 para 0,1 segundos

; Miscellaneous
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
M950 D1 C"spi.cs0+spi.cs2" ; PanelDue
M591 D0 P3 C"io6.in" S1 R5:170 ; filament monitor connected to io6.in

@droftarts
In these days I made several impressions to fine-tune the resolution that until then I could not make due to so much instability of operation. The last impressions with a 0.8 beak are getting good. using simplify3D that seems somewhat limited compared to Cura.
Even so, when starting the second layer, the table does not go down to the correct value. When it goes to third, it works normally. It's very strange. It doesn't make any sense. I lowered the Jerk values a lot from 500mm/min to 300mm/min. The z was at 110 I went to 60mm/min, but I will lower it more to see if it solves the problem of the second layer, it is interesting because it goes down only half the value stipulated by the slicer. But only in this layer that does this. Then take off cute.

@tas
In the config.g in the file everything is with a dot, but I'll check, you'll see that something typing is getting in the way too

@droftarts IMG_4889.MP4

@droftarts

@droftarts

I believe we have discovered the problem. I started to slow down
changing microsteps from 16 to 8 and Z began to move as programmed in the slicer. Without being satisfied with the result, I went back to 16 microsteps and lowered the instantaneous on Z by approximately 30%. Then I managed to print a piece with a higher quality than what I had until then. Even so, the first to second layer is not respecting the programmed distance.
EX: the first layer starts at Z=0.40mm (this height is correct according to the baby step, also from 0.40mm or less. In the slicer, a layer height of 0.3mm was determined, so the second layer would start with Z=0.7mm , but it was only for 0.51mm, so I did a manual intervention just to understand if the next layers would maintain this flaw (I paused the printing and lowered the table manually to complete the 0.19 mm) when the second layer was finished and the third started. the value was already correct Z=0.81 mm. It seems to me like a bug in the firmware, it doesn't make sense to do that.

@oliof said in Problems from the second layer to the 7th layer:

@carlinicompetizione A raspberry pi does not help here. There is some chance that this is not a software, but a hardware issue, i.e. the mechanism raising the nozzle (or lowering the bed) may be binding until it overcomes the early layers.

You could try commanding the printer without issuing a full print, doing moves with the G0 and G1 commands after homing, to see how things behave.

I would like to know if there is a possible solution to this problem that the system has that disregards the first layers?, the printer is industrial, and I have already spent too much time making it work with this Duet 3D 6HC card. I really need a solution, otherwise I have to change my motherboard to another brand that is less problematic and can print without so much hassle.

@droftarts

Having activated the M208 seems to have solved the problem, but it is still not going down, do the first one each, and remain in the same Z, it only starts to change from the 4th layer that starts to go down the Z, the second and the third it prints even Z then there is that excess plastic, the interesting thing is that the display shows the value of X,Y, Z, when the extruder moves in the map, this does not show, it is only from the 4th layer that it starts to descend, for example, it starts printing at Z=2 9 this value is the baby step. finishes the first layer and goes to the second and it doesn't change, it stays at Z=2, finishes the second layer and goes to the third and Z=2 continues. When the 4th layer begins, Z = 2.4 because I established a layer height of 0.4 mm in Simplify 3D. in fact it should be at Z=3.6. the extruder starts hitting the print.

@droftarts

It may be that the Map is not loading, I need to add some command to the config. g to load and activate the created map?

@droftarts

Ian, thank you very much for the guidance, I did as you suggested,
The M208 is actually deactivated, I activated it. The Z tests with perfect F8000 drops 25 5 without any problems! When I send the command G29 S3 and G29 S1 there is an error reading the map and I cannot load it. I'm going to change the CURA configuration to RRPP even today it is with Marlin, but in config.g the command is as M83.