Cura Sliced Prints Have Craters On Seams

alexus

so just finished my build and when i prrint parts i see at the end of later and seam spot nozzle stops for about 1 sec before moving up makes makes a crater. I think it might be related to retract time .. my retract is 6.5mm but if i reduce thhat i get spider web. is there any way to remove that behaviour? im comparing to makerbot and i dont see that on maker bot... actually my seam likes quite bad comparing to makerbot (tried different setting) also good to mention bowen line is long but i think its not related as nozzle is ironing spot with heat /delay

any idea? its this cura related or machine settings?

help is appreciated
tnx

Nuramori

@alexus what version Cura?

alexus

@nuramori

latest one form their website.. if im not mistaken 4.9

Phaedrux

Can you share your config.g?

How fast are you trying to retract?

alexus

@phaedrux
sure will send config when i get to printer
speed of retraction is E0 speed?

Phaedrux

@alexus said in Cura Sliced Prints Have Craters On Seams:

speed of retraction is E0 speed?

It would be set in your slicer, but ultimately limited by the maximum E speed set in config.g, along with the acceleration and jerk settings there.

alexus

@phaedrux
well i guess flow of extrusion was my other question and i cold not find where to sent flow any where so i was controlling it with slider to set it 300% as at 100% i was not getting enough material to hold model layers. Never the less i not really think its hole burned is flow related as i think if i some hor reduce amount of delay to 0 then there will be no heating and melting of a crater at seam

whats jerk?

Phaedrux

@alexus said in Cura Sliced Prints Have Craters On Seams:

whats jerk?

Think if it as the minimum speed to use when doing a sharp direction change.

If your flow rate is very low you might not have the correct filament diameter set in the slicer, or your E steps per mm could be very wrong.

Try going through this calibration guide: https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40

It would also help to see your config.g and a sample sliced gcode file from cura.

alexus

@phaedrux
here is G config, also i did calibrate E0 to extract exact amount as expected ex 100mm gets me 100mm on cold filment. i will go through link to see if i missed anything

for filament diameter its 1.7 measured, and i think cura setting was 1.83 something (will double check)

here is link to print file https://we.tl/t-6Ir4qixkiK
it was 1mb so loaded to we transfer

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Tue Jun 08 2021 21:52:22 GMT-0400 (Eastern Daylight Time)

; General preferences
G90                                     ; send absolute coordinates...
M83                                     ; ...but relative extruder moves
M550 P"Duet2Wifi"                       ; set printer name

; 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 X
M569 P1 S1                              ; physical drive 1 goes forwards Y
M569 P2 S0                              ; physical drive 2 goes forwards Z
M569 P3 S1                              ; physical drive 3 goes forwards
M584 X0 Y1 Z10 E3                        ; set drive mapping (Alexus backup: X0 Y1 Z2 E3)
M350 X16 Y16 Z16 E16 I1                 ; configure microstepping with interpolation
M92 X80.00 Y44.44 Z320 E800       		; set steps per mm (Alexus 6.28.21 - fine tuned alredy - do not edit)
M566 X800.00 Y800.00 Z100.00 E120.00     ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z800.00 E1200.00 ; set maximum speeds (mm/min)
M201 X800.00 Y800.00 Z100.00 E250.00     ; set accelerations (mm/s^2)
M906 X800 Y1200 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 X500 Y500 Z300 S0                  ; set axis maxima

; Endstops
M574 X1 S1 P"!xstop"                     ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"!ystop"                     ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S1 P"!zstop"                    ; configure active-high endstop for low end on Z via pin zstop
;M574 Z1 S2								 ; Config to use Prbe as Z Limit (Alexus)

; Z-Probe
;Alexus BL Touch Declarations
M558 P9 C"^zprobe.in" H5 F100 T2000			; Type 9 BL Touc, w/ pull up, H5 is dive heght 5mm
M950 S0 C"exp.heater3"						; heater 3 epension port - pin 8 yellow wire for servo deploy PWM
G31 X28.78 Y0 Z2.25 P25						; Probe Offest 
; END declarations
M557 X150:350 Y150:350 S20	               	; define mesh grid

; Heaters
M140 H-1                                      ; disable heated bed (overrides default heater mapping)
M308 S0 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin e0temp
M950 H0 C"e0heat" T0                          ; create nozzle heater output on e0heat and map it to sensor 0
M307 H0 B0 S1.00                              ; disable bang-bang mode for heater  and set PWM limit
M143 H0 S280                                  ; set temperature limit for heater 0 to 280C

; 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"fan1" Q500                          ; create fan 1 on pin fan1 and set its frequency
M106 P1 S0 H-1                                ; set fan 1 value. Thermostatic control is turned off

; Tools
M563 P0 D0 H0 F-1                             ; 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
M575 P1 S1 B57600                       ; enable support for PanelDue
M501                                    ; load saved parameters from non-volatile memory

Phaedrux

Your Z and E speeds are quite slow. Try these values

M566 Z100 E3000     ; set maximum instantaneous speed changes (mm/min)
M203 Z800 E6000 ; set maximum speeds (mm/min)
M201 Z200 E2500     ; set accelerations (mm/s^2)

It looks like your retraction is set to 6.5mm and had very slow extruder speeds, so those pauses were probably from waiting for the extruder to retract. Have you tuned your retraction distance and speed yet?

G1 F1500 E-6.5

6.5mm at 25mm/s, but your previous settings for E limited the speed to 20mm/s

Try increasing the retraction speed in the slicer to 50mm/s or 60mm/s
That may even let you reduce the distance used and still avoid the spider webs.

alexus

@phaedrux

i did not tube retraction speed, i guess need to go throuhdocument and see how to do it
will try to increase speed and accesration parameters

in CURA retraction speed is hidden i guess? i did not see it in list but will double check again... lets play around when current print is done

tnx for helping

Phaedrux

If you alter the M566, M201 and M203 commands in your config.g as I showed above that will remove the firmware speed limit you currently have. Then all you have to do is increase the retraction speed in Cura and I think that should help quite a bit.

If you want to get more detailed into retraction tuning you can use firmware retraction which lets you set the retraction speed and distance within config.g and alter it during the print itself to more quickly try new values, as opposed to baking the values into the sliced gcode file.

https://forum.duet3d.com/topic/5993/firmware-retraction-tuning-with-macros

alexus

@phaedrux
so updated file w/ extruder speed ... things got better yet there are still some artifact... i will read about tuning flow and and back to this... probably will finish my current job 1st as i need 10000 of peaces in any quality :)))