Issues with pressure advance since RRF 3.4

[dc42]

@brunofporto said in Issues with pressure advance since RRF 3.4:

Here an example for PLA from 0.5 to 0.9 - The bulge NEVER disappear even when the under extrusion after starts to show.

I'm looking forward to seeing your comparative results for RRF 3.3 and 3.4.2.

How long is the Bowden tube between the extruder drive and the hot end?

[Argo]

Small update for RRF 3.4.2. (stable) release.
PA was set to 0.052, printing PLA.
LDO Orbiter 2 extruder
Input shaper ZVDD used (M593 P"zvdd" F40.5 S0.03)

New test object (from a duet_rrf Voron channel user) to demonstrate the created overhang by the bulging corner which you can see when you flip it over:

[gloomyandy]

@argo I'm not totally sure what it is we are looking at here. Can you post a picture that shows the full object partially from the side (rather than directly above) so we can get a better idea about the test print you have used?

[Argo]

@gloomyandy

Here's the object from another perspective. Imo it's a rather good test to see the actual material that overshoots when flipping the object. In my last post, when viewing the second picture in full screen you can see overshooting edge.

Second picture from last posting but cropped so you can see what I mean:

Unfortunately the bulging makes the printer unusable for me atm because I can only print round objects. For now the printer stays at RRF so I can share test prints when a new FW version gets released but I plan to move to Klipper in the near future (when I find the free time) if the issue remains.

Also the stl:
bulgecheck.stl

[dc42]

@argo most slicers have a parameter to set the degree of overlap between infill and perimeters. What slicer are you using, and what overlap parameter?

[Argo]

@dc42

I tried following slicers: Prusa Slicer, Super Slicer, Ideamaker and tried infill/perimeter overlap between 10% and 25%.

[ArminP]

Think i have the same problem with corners.

My System :
Hardware:

• Duet 3 6HC
• Duet 3 Tool Board 1LC
• Orbiter 2 Extruder

Firmware 3.4.3

SuperSlicer:
PA 0.2 on PETG

[Argo]

@ArminP

Tbh I'm not expecting a fix anymore. Too few are having issues and I understand that a problem that can't be reproduced is not fixable...

[R4ffers]

@argo I have it too

[ArminP]

I think i found my problem

I used the wrong parameter.

SET_PRESSURE_ADVANCE ADVANCE=0.2

M572 D0 S0.13

[Argo]

@arminp

I‘m glad you fixed your problem.

[Phaedrux]

@argo said in Issues with pressure advance since RRF 3.4:

@ArminP

Tbh I'm not expecting a fix anymore. Too few are having issues and I understand that a problem that can't be reproduced is not fixable...

It's true that it's not easy solving a problem that can't be reproduced, but we have not given up either.

[Argo]

@phaedrux

What would be different in your environment to mine? I mean what if a Duet test machine does show the problem. Is there a debugging firmware involved that does provide more data?

[MartinNYHC]

Same bulging here.

6HC + 1LC with RRF 3.4.3 and PA 0.035.

[gloomyandy]

@r4ffers If you think you have this problem please post details of your configuration (mainboard, toolboard or expansion board if any, pressure advance setting, Input shaper setting, print speed, acceleration, jerk), plus if you can a photo showing an example of the problem.

[R4ffers]

@gloomyandy Hi, here's some info.

Voron v2.4
Duet3 mini5+ with SBC
Duet3 mini2+ expansion board
Toolboard 1LC v1.2
LGX lite extruder
Firmware 3.4.3
PA 0.095

Tried with superslicer & prusaslicer
Tried different speeds, accelerations & jerk settings giving same results.

[R4ffers]

@gloomyandy Here's my config file, Speed macro & prusaslicer gcode
1664142820911-bulgecheck.gcode

; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
M550 P"duet3"
; ================================
; PanelDue
; ================================
M575 P1 S1 B57600

; ================================
; Toolhead leds
; ================================
M150 X3 Q3000000
;M150 B255 P255 S1 F1
M150 W255 P255 S2 F0

; General preferences
M111 S0                	; Debugging off
G21                    	; Work in millimetres
G90                     ; send absolute coordinates...
M83                     ; ...but relative extruder moves

M669 K1                 ; select CoreXY mode

; Limit axis				
M564 S1 H1             	; Forbid axis movements when not homed
						; H1	Forbid movement of axes that have not been homed
						; S1	Limit movement within axis boundaries

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

; ================================== 
; DRIVERS
; ==================================

M569 P121.0 S0                                   ; E - physical drive 121.0 goes backwards

M569 P0.5 S1 D2                                  ; A -> Y - physical drive 0.0 goes forwards
M569 P0.6 S1 D2                                  ; B -> X - physical drive 0.1 goes forwards

M569 P0.0 S1                                     ; Z0 - physical drive 0.3 goes forwards
M569 P0.1 S0                                     ; Z1 - physical drive 0.4 goes backwards
M569 P0.2 S1                                     ; Z2 - physical drive 0.5 goes forwards
M569 P0.3 S0                                     ; Z3 - physical drive 0.6 goes backwards

M584 X0.6 Y0.5 Z0.0:0.1:0.2:0.3 E121.0           ; set drive mapping
M350 X32 Y32 Z32 E16 I1                          ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z800.00 E562.00              ; set steps per mm

; Accelerations and speed are set in separate macro
M98 P"/macros/set_normal_speed.g"

; Stepper driver currents
; set motor currents (mA) and motor idle factor in per cent
; Drive currents
M906 X1200 Y1200 Z1200 E600 I70                  ; XYZ and E current
M84 S120                                         ; Idle timeout

; ==================================
; Endstops						
; ==================================

; Endstops
M574 X2 S1 P"^121.io0.in"                       ; configure active-high endstop for high end on X via pin ^121.io0.in
M574 Y2 S1 P"^0.io1.in"                         ; configure active-high endstop for high end on Y via pin ^io1.in
M574 Z0 p"nil"                                  ; No Z endstop

; Magnetic filament sensor
;M591 D0 P3 C"121.io1.in" S1

; Axis travel limits                            ; Mind this is travel NOT print area
M208 X0:350 Y0:360 Z-0.5:300                    ; Set axis minima - negative X is to have 0,0 on bed corner
                                                ; WARNING on Z not to hit the roof - this is set here

; Belt Locations
M671 X-60:-60:410:410 Y-10:420:420:-10 S20      ; Define Z belts locations (Front_Left, Back_Left, Back_Right, Front_Right)
											    ; Position of the bed leadscrews.. 4 Coordinates
											    ; Snn Maximum correction to apply to each leadscrew in mm (optional, default 1.0)
                                                ; S20 - 20 mm spacing
M557 X50:300 Y40:325 P6                         ; Define bed mesh grid (inductive probe, positions include the Y offset!)

; ==================================
; Bed heater
; ==================================
M308 S0 A"Bed Heater" P"temp0" Y"thermistor" T100000 B3950     ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" Q10 T0                           ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 R0.637 C222.4 D0.95 S1.00 V24.0      
M140 H0                                          ; map heated bed to heater 0
M143 H0 S120                                     ; set temperature limit for heater 0 to 120C

; ==================================
; Hotend heater 
; ==================================
M308 S1 A"Nozzle" 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 R2.518 C174.0 D6.14 S1.00 V23.8
M143 H1 S270                                     ; set temperature limit for heater 1 to 270C

; ==================================
; SENSORS MISC 
; ==================================

; Define MCU sensors which will be available in DWC Extra View
M308 S3 A"MCU" Y"mcu-temp" 						; Officially NOT supported on Mini 3 5+ however seem to work
M308 S4 A"Duet Drivers" Y"drivers" 		        ; This is not really working as it is just a threshold crossing

; ==================================
; CHAMBER SENSOR 
; ==================================
M308 S10 A"Chamber" P"0.temp2" Y"thermistor" T100000 B3950

; ==================================
; Z PROBES K0 (mag probe) and K1 (Microswitch Z0)
; ==================================

; MAG PROBE (GND, IO)
; -----------
; This is the mag probe with microswitch in Afterburner
M558 K0 P8 C"^121.io2.in" T18000 F600:180 H5 A10 S0.03
G31 K0 P500 X-2.5 Y24.5 Z0.86 ;Z

; Z-SWITCH
; -----------
; This is the microswitch which is pressed by the Noozle
M558 K1 P8 C"^io5.in" T18000 F1200:180 H3 A10 S0.005 R0
; Omron micro switch
G31 K1 P500 X0 Y0 Z0.47

; Part cooling fan
M950 F0 C"121.out1"                              ; create fan 0 on pin 121.out2 and set its frequency
M106 P0  H-1 C"Part cooling fan"                 ; set fan 0 value. Thermostatic control is turned off

; Hotend fan
M950 F1 C"121.out2"                              ; create fan 1 on pin 121.out1 and set its frequency
M106 P1 S1 H1 T45 C"Hotend fan"                  ; set fan 1 value. Thermostatic control is turned on


M950 F2 C"0.out4"                                ; create fan 2 on pin out4 and set its frequency
M106 P2 S1 H3:4 T30 C"Controller fan 1"          ; controlled by Sensor 3 - MCU 
; Controller fan 2
M950 F3 C"0.out3"                                ; create fan 3 on pin out3 and set its frequency
M106 P3 S1 H0 T60 C"Controller bay fan 2"

; 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

M955 P121.0 I05

; Input shaper
M593 P"ei2"  F48

; Pressure advance
M572 D0 S0.095

; Calibration skew correction
M556 S100 X0.542

; Custom settings are not defined

; defines global variables
M98 P"/macros/define_global_vars.g"

; Load override parameters
M501

T0

; Sets normal speeds and acceleration for printing operation

M566 X300 Y300 Z240 E200           ; Set Jerk
M203 X36000 Y36000 Z9600 E7200     ; Set maximum speeds (mm/min)
M201 X10000 Y10000 Z700 E10000     ; Set maximum accelerations (mm/s^2) 
M204 P10000 T10000                 ; Set printing acceleration and travel accelerations

[Argo]

@r4ffers

PA 0.095 is quite high for direct drive setup.
Do you also get incomplete infill lines if you increase PA further to get less bulging corners?

[bot]

@r4ffers One thing I would try if I were you would be to increase the E jerk a little, and drastically decrease the E acceleration. You never need that much E accel. It becomes completely pointless -- essentially no E acceleration is ever applied because there are not enough steps to interpolate speeds across.

Try E Jerk 500 and E Accel 2500.

[R4ffers]

@argo I've been messing around with it for the last week. I had it set at 0.055 previously. I have noticed zero change to PA when updated in config.g However I was tinkering earlier and when I change PA live using paneldue whilst printing it does have an effect. I got the corners not perfect but not too bad, updated config.g with new PA value. Ran the print again and back to crap corners again. It's almost like PA value in config.g is being ignored.