I have finally dialed in the value. Apparently 0.11 is too much.

I printed the "toleromancer" a 0.1mm offset test print with 1mm, 1.5mm, 2mm, 2.5mm interlocking features:

This allowed me to fine tune the values with "real world" application: fitment.

0.000 didn't fit, as expected.
0.100 fit but snugly, so not optimal
0.110 fit, but with snugness on the smallest 1mm part, kind of counterintuitive

0.105 fit perfectly with 0.1mm tolerance throughout including the 1mm part.

Hereby I present you the Toleromancer:

https://www.thingiverse.com/thing:4794036

Greetings again!

I have set up my Prusa MK2.5S/Bear Extruder/Full Bear/Duet 2 WiFi upgrade combo and so far it seems to print at least.

I am facing weird looking extrusion artifacts I have never seen before though..

On one axis, I am getting intense vibrations, like, I can feel them with my nail:

The other axis side gets moire effect I have seen on Prusa github issues with MK3 owners..

My config is as follows:

; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Sat Nov 30 2019 21:16:45 GMT+0200 (Eastern European Standard Time)

; General preferences
G90                                       ; send absolute coordinates...
M83                                       ; ...but relative extruder moves
M550 P"Prusa Bear MK2.5"                              ; 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
M569 P1 S1                                ; physical drive 1 goes forwards
M569 P2 S1                                ; physical drive 2 goes forwards
M569 P3 S0                                ; physical drive 3 goes backwards
M584 X0 Y1 Z2:4 E3                        ; set drive mapping
M671 X-36.0:290.0 Y110:110 S1             ; Set the Z motor relative locations correction 1mm
M350 X16 Y16 Z16 E16 I1                   ; configure microstepping with interpolation
M92 X100.00 Y100.00 Z400.00 E138          ; set steps per mm
M566 X600.00 Y600.00 Z12.00 E150.00       ; set maximum instantaneous speed changes (mm/min)
M203 X9000.00 Y9000.00 Z360.00 E7200.00   ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z200.00 E10000.00  ; set accelerations (mm/s^2)
M906 X600 Y600 Z600 E800 I30              ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                   ; Set idle timeout

; Axis Limits
M208 X0 Y-4 Z0 S1                         ; set axis minima
M208 X250 Y210 Z210 S0                    ; set axis maxima

; Endstops
M574 X1 Y1 S1                             ; set active high endstops
M574 Z1 S2                                ; set endstops controlled by probe

; Z-Probe
M558 P1 H0.85 F600 T12000 ;A3 S-0.03      ; set Z probe type to switch and the dive height + speeds
G31 P500 X23 Y5 Z0.625                    ; set Z probe trigger value, offset(original 0.875) and trigger height
M557 X24:228 Y6:210 S50                   ; define mesh grid

; Filament Sensor
M591 D0 P2 C3 S1

; Heaters
M307 H0 B0 S1.00                          ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4725 C7.060000e-8 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 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
T0                                        ; select first tool
;M572 D0 S0.104                           ; pressure advance test

If anybody could see if anything is really wrong with my config, I would really appreciate this.

Right now the cube I have is perfectly 20x20x20mm and 0.45mm walled. So I would just love to get rid of these artifacts..

I have finally dialed in the value. Apparently 0.11 is too much.

I printed the "toleromancer" a 0.1mm offset test print with 1mm, 1.5mm, 2mm, 2.5mm interlocking features:

This allowed me to fine tune the values with "real world" application: fitment.

0.000 didn't fit, as expected.
0.100 fit but snugly, so not optimal
0.110 fit, but with snugness on the smallest 1mm part, kind of counterintuitive

0.105 fit perfectly with 0.1mm tolerance throughout including the 1mm part.

Hereby I present you the Toleromancer:

https://www.thingiverse.com/thing:4794036

Toying around I found a easier way to notice what I need to look for.

I just printed 20x20x10(cut in half) 15% grid infilled cubes with no top and seam aligned in the rear, fast prints really.

This allowed me to see how the seam and corners react.

Using MK1 fingers ( @deckingman ) not MK1 eyeballs I was able to feel the difference and found my perfect value which is 0.11. So if anybody stumbles here with similar setup, feel free to use this as a baseline.

Marking this as solved. What an adventure!

Thanks for indepth explanation @deckingman I suspected as much that I will need to fine tune it a lot and especially for different filaments. Maybe I just grew up spoiled by Linear Advance.

I did another test from another thread, a 2 perimeter 40x40 cube using prusaslicer:

Somehow I feel like something around 0.1 is what I need.

@droftarts

I have tried below 0.1 (0.05-0.1) including the PA test prints and regular cube prints. Right now I have narrowed it down to 0.13-0.135, going to print some cubes and see what I get.

Greetings,

I am trying to dial in Prusament PETG with pressure advance and I am getting very weird values and indecisive results..

Here is my configuration:

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Thu Mar 11 2021 17:12:54 GMT+0200 (Eastern European Standard Time)

; General preferences
G90                                                     ; send absolute coordinates...
M83                                                     ; ...but relative extruder moves
M550 P"Prusa Bear MK2.5"                                ; 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
M569 P1 S1                                              ; physical drive 1 goes forwards
M569 P2 S1                                              ; physical drive 2 goes forwards
M569 P3 S1                                              ; physical drive 3 goes forwards
M569 P4 S1                                              ; physical drive 4 goes forwards
M584 X0 Y1 Z2:4 E3                                      ; set drive mapping
M671 X-36.0:290.0 Y110:110 S1                           ; Set the Z motor relative locations correction 1mm
M350 X16 Y16 Z16 E16 I1                                 ; configure microstepping with interpolation
M92 X200.00 Y200.00 Z400.00 E280.00                     ; set steps per mm
M566 X800.00 Y800.00 Z60.00 E3000.00 P1                 ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z900.00 E6000.00               ; set maximum speeds (mm/min)
M201 X6000.00 Y6000.00 Z200.00 E5000.00                 ; set accelerations (mm/s^2)
M204 P600 T3000						; Set accelerations (mm/s^2) for print and travel moves
M906 X1200 Y1200 Z600 E1200 I30                         ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                                 ; Set idle timeout

; Axis Limits
M208 X0 Y-4 Z0 S1                                       ; set axis minima
M208 X250 Y210 Z210 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 S2                                              ; configure Z-probe endstop for low end on Z

; Z-Probe
M558 P1 C"zprobe.in" H0.85 F600 T12000 A3 S0.03         ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X23 Y5 Z0.975                                  ; set Z probe trigger value, offset and trigger height
M557 X24:228 Y6:210 S50                                 ; define mesh grid

; Heaters
; prusa mk2.5 bed
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 C0       ; 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 B0 S1.00                                        ; disable 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
M307 H0 R0.321 C270.9 D10.56 S1.00 V12.7                ; set PID for bed
; e3d hotend
M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8  ; 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 B0 S1.00                                        ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S300                                            ; set temperature limit for heater 1 to 280C
M307 H1 R2.637 C231.0 D7.78 S1.00 V12.7                 ; set PID for the hotend

; 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 S1 H1 T45                                       ; set fan 1 value. Thermostatic control is turned on

; 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

; Custom settings are not defined

The printer is a converted Prusa to full Bear including X axis and extruder.

During the python script and slicer PA calibration tests I tried many values but they give me nothing compared to the official guide.

In the guide, direct extruders go for "0.025 and up".

Here is the first test 0.0-0.5:

Another test of 0.1-0.3:

Another test of 0.1-0.2:

Another test of 0.125-0.175:

Anybody suspects what could be wrong? These values appear way too large for a direct drive extruder. Maybe it's the specifics of PETG? Maybe some of my extruder settings are wrong?

ABS, a bit better cooling.

So it must be filament then?

@DocTrucker said in Prusa upgraded to duet, weird extrusion:

PETG can run hotter than 210 with my machine but 230C on mine may well be similar to 210C on yours. That said my part quality isn't A1 either. Assume you're running minimal part cooling on anything other than overhangs? ABS is supposed to flow better than even PLA, but it stinks and irritates my throat so not tried it on my home machines.

I print PETG at 250'C as per manufacturer.

There was no sufficient cooling and I think my bed thermistor setting is crap.

90'C bed results in a 102'C reading on my FLIR.

@DocTrucker said in Prusa upgraded to duet, weird extrusion:

@Murloc992 what layer thickness are you using?

0.2, tried 0.10, 0.16 and 0.24.

I just printed a part with ABS..

and..

there's almost no extruder artifacts..??? (except for printing ABS in open air, getting drooping on overhangs, etc.)

Maybe there are some vibrations, but no apparent diagonals.. Maybe a TINY bit of irregular extrusion..

Is it the filament I use, the PETG I mean..?

What..

So lost..

@DocTrucker said in Prusa upgraded to duet, weird extrusion:

@Murloc992 those are some conservative speeds. Seen a track width of 0.45 mentioned. Are you running a normal 0.4mm nozzle? Layer thickness? E3D V6 with 0.4mm nozzle passing PLA at 210-230C can do 100mm/sec at 0.25mm layers and 0.48 track width.

Big thread, excuse me if those questions have been covered.

Usually I print at 60-100mm/s using PETG. My hotend is genuine E3DV6 with 0.45 extrusion width. Right now I am experimenting with 200% speed modifier applied to my profile. The printer is literally flying and I can't see anything wrong with the print right now. 27 minute print seems to be completed in just 16.

@droftarts In fact, the faster I print, the less artifacts I get. 15mm/s perimeter speed was in the previous pictures. 30mm/s perimeters give me less artifacts, 45mm/s feels like they don't really exist, 60mm/s erases them completely.

"Just don't print small things until you have 24V"?