Hi, I have recently finished building a CoreXY build and I am using a Duet 2 Wifi.
For endstops I am using a microswitch on every axis. The build is working great, and the Duet 2 is great piece of hardware.
However, I am having trouble configuring the software correctly for that all important first layer.
The bed is leveled manually in a hot state, and yes, I have been working with 3D printers for around 3 years now. I know how to level a bed.
The Z carriage also sits level inside the frame.
Still, when I want to start printing, the first layer always comes out too high, and I need to babystep the bed down by -0.2mm for a good first layer. If this would be all I had to do to get good prints, I would understand that my leveling is off.
However, the following layers now are too low and the nozzle digs into the part, and for the rest of the print to work out, I need to babystep up to 0.3mm, so in total a 0.5mm difference between the first layer and second layer. If I don't do this, the first 10 or so layers will come out scrambled.
The weirdest thing to me about all this is, that when I manually move the nozzle to the middle of the bed as if it would start printing, and then raise the nozzle by whatever my first layer-height should be, it looks fine and as if it should work.
However, when the printer then takes over and does the first layer, the nozzle is way too high above the bed, even though it's displayed as if it was raised by the same amount in the web interface as when I did it manually.
e-steps are also not off, parts come out dimensionally correct.
Anyone able to help me out here?
Here is my config file:
; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun Apr 26 2020 19:19:34 GMT+0200 (Central European Summer Time)
; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"V-Core Pro" ; set printer name
M667 S1 ; select CoreXY mode
; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet
; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 E16 I0 ; configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E824.73 ; set steps per mm
M566 X500.00 Y500.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z3000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X900.00 Y900.00 Z30.00 E250.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X290 Y310 Z250 S0 ; set axis maxima
; Endstops
M574 X1 Y2 Z1 S1 ; set active high endstops
; Z-Probe
;M558 P0 H5 F120 T6000 ; disable Z probe but set dive height, probe speed and travel speed
;M557 X15:215 Y15:195 S20 ; define mesh grid
; Heaters
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B3950 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C
; Fans
M106 P0 S0 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
; Tools
M563 P0 S"E3D V6" 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
; 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
And also my start g-code:
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 ;home axes
G1 Z15.0 F{speed_travel} ;move the platform down 15mm
G92 E0 ;zero the extruded length
G1 F200 E6 ;extrude 6 mm of feed stock
G92 E0 ;zero the extruded length again
G1 F{speed_travel}