First Benchy printed - Issues

Veti

post your config

TF_Sinthoras

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Tue Oct 09 2018 13:27:56 GMT+0300

; General preferences
M80 ; Turns on the ATX power supply
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"BLV MGN CUBE Z-565" ; Set machine name
M669 K1 ; Select CoreXY mode - war 667

; Network
M552 S1 ; Enable network
M587 S"BlackIC" P"/Taschi99" ; Configure access point. You can delete this line once connected
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M569 P0 S1 ; Drive 0 goes backwards blv: its was S1
M569 P1 S1 ; Drive 1 goes backwards blv: its was S1
M569 P2 S0 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes backwards WAS 0
M584 X0 Y1 Z2 E4 ; NEW set drive mapping Z2 left, Z4 right
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation war 16 16 16 1
M92 X200 Y200 Z400 E409.27 ; Set steps per mm for Bondtech. X200 Y200 Z400 E415 ; Kali: X198.51 Y198.90
M566 X700 Y700 Z24 E2000 ; Set maximum instantaneous speed changes (Jerk) (mm/min) Z240
M203 X18000 Y18000 Z250 E2000 ; Set maximum speeds (mm/min) z1000
M201 X3000 Y3000 Z100 E4000 ; Set accelerations (mm/s^2) z100
M906 X1600 Y1600 Z1600 E1600 I30 ; Set motor currents (mA) and motor idle factor in per cent z800
M84 S120 ; Set idle timeout

; Pressure advance
; M572 D0 S0.05 ; disabled Pressure advance

; Axis Limits
M208 X-22 Y22 Z0 S1 ; Set axis minima
M208 X301 Y310 Z500 S0 ; Set axis maxima

; Endstops
M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
M574 Y2 S1 P"ystop" ; configure active-high endstop for high end on Y via pin ystop

; Filament sensor
M591 D0 P1 C3 S1 ; Set Filament sensor Simple type (High) for extruder drive 0, connected to endstop input 3 (E0)

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P1 C"^zprobe.in" H5 F300 T9000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y0 Z0.74 ; set Z probe trigger value, offset and trigger height
M557 X25:300 Y60:300 S80 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" A"Bed" T100000 B4725 C0.0000000706 R4700 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 A156.6 C925.3 D2.2 V23.4 B0 ; Heatbed PID Heater 0 model: gain 159.6, time constant 925.3, dead time 2.2, max PWM 1.00, calibration voltage 23.4, mode PID
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" A"Hotend" T100000 B4725 C0.0000000706 R4700 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 A269.2 C128.8 D7.6 V23.7 S0.9 B0 ; Hotend PID .4mm Heater 1 model: gain 269.2, time constant 128.8, dead time 7.6, max PWM 0.90, calibration voltage 23.7, mode PID
M143 H1 S270 ; set temperature limit for heater 0 to 260C
M308 S2 P"mcu-temp" Y"mcu-temp" A"Duet Board" ; Configure MCU sensor

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan2" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 S"E3Dv6" 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
M564 H0 ; Let the Jog buttons work blv: added to allow jog buttons

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

Argo

What are your Slicer settings?
Looks like it is a bit too hot or needs a bit more retraction or is printed too fast.
I'd say too much acceleration also as I see ringing on the side.

theruttmeister

@TF_Sinthoras said in First Benchy printed - Issues:

Hello Community,

I have build up my BLV MGN Cube (XY-Core) with a Duet2 Wifi and now I get everything to Work. I did the PID Calibration of Heatbed and Hotend, Calibration via 20mm Cube and now I have printed my first Benchy. I get some Issues and have no Idea how to go on, can you help me with your experience? Material is PETG from "DasFilament". I run this Material on my Ender 3 already and have quite good results.

Here the Pictures:

Ripple

Looks like classic motor instability. Steppers have a speed range where they provide smooth motion as well as speeds where they do not. If you print a tower that increases in speed with height you can identify the optimum speed for your motors.
Then use that speed for the outer wall.
For example, I print everything but the outer wall at 80mm/s, but the outer wall at 25mm/s.

sudden little Overextrusion

Its oozing when it reaches the end of a line, slicers have multiple different ways of dealing with that. Look at retraction (retracting too slowly can give the hotend enough time to ooze, for example). Could also be too high a temp.

fine Stringing

Either not retracting enough, or more likely too high a temp.

You have any ideas? Thanks a lot for everything.

Tobias

TF_Sinthoras

Thank you all for the advices, the thing with the Speed is interesting, I will try that on the weekend.

I use 245°C for printing of the PETG Filament. Is this already High for PETG?
Speed at the moment is 60mm/s
Retraction at 6mm
Retract speed at 50mm/s

Extruder is a Bondtech BMG
Hotend E3D V6 Full Metal

Seems that to be okay?

Blacksheep99

@TF_Sinthoras

Is it a direct drive? 6mm retraction is more a bowden retraction distance which is why i ask. I print pet closer to 45mm/s.

theruttmeister

@TF_Sinthoras said in First Benchy printed - Issues:

Thank you all for the advices, the thing with the Speed is interesting, I will try that on the weekend.

I use 245°C for printing of the PETG Filament. Is this already High for PETG?
Speed at the moment is 60mm/s
Retraction at 6mm
Retract speed at 50mm/s

Extruder is a Bondtech BMG
Hotend E3D V6 Full Metal

Seems that to be okay?

I agree with the @Blacksheep99, the retraction distance seems very long, its been a decade since I used a bowden, but it seems high even for that. The time to retract that far is probably causing the blobs.

And 245°C might be fine... but it varies based on exact material, extruder, individual thermistor etc. Best thing to do is print some test parts at 5 or 10 degree intervals.
PET can tend to be a bit more stringy than PLA. It doesn't have quite a big a thermal window, so it needs a little more work to get a temp high enough for your speed needs without getting stringing.

Veti

print a temperature tower as well after calibrating the retraction distance

Stephen6309

@TF_Sinthoras The ripple may be caused by the infill. Try increasing the number of perimeters.

I'm currently using M207 S1.5 F6000 R0 Z0.03 for firmware retraction on my BMG Direct drive and it works for PETG and PLA.

TF_Sinthoras

Thank you all for the messages,

I made a temp tower because I used the 245 degrees I used on my ender 3, but it turns out that 235 give me the best results.

I use a bowden extruder, maybe I should reduce the retract and look where it gets me. But in my mind the more retracts is preventing blobs, because there is not to much material, so why reduce it to reduce blobs?

Do you have a good file for retract distance calibration?

The ripple I got away by changing the place for the printer and putting some rubber sheet under it, this helped a lot.

Blacksheep99

@TF_Sinthoras You can use the retraction tab here to tune it.

https://teachingtechyt.github.io/calibration.html