Resume print

GT1Za

Hi everyone,
I'm having an issue when I pause and resume a print, normally to change filament.
The pause works flawlessly, which then enables me to switch filament. But when I resume, it homes the print head to the bottom left and then moves in a diagonal position to where it left, sounds good in theory, but the problem is that it often crosses the print before its reached the z height and knocks the print off the bed.

Is there a way to get the resume to first travel to the correct z height then move to the x/y coords?

MikeS

On resume.g add this line at the start:

G1 R1 Z5 F6000

Change F6000 with your move speed. This wil first go 5mm above the position of the last print move before pause occurs.

Phaedrux

Can you post your pause and resume files?

What firmware version are you running?

GT1Za

hi,
sorry my resume looks like the below:

G1 R1 X0 Y0 Z5 F6000 ; go to 5mm above position of the last print move
G1 R1 X0 Y0 ; go back to the last print move
M83 ; relative extruder moves
G1 E10 F3600 ; extrude 10mm of filament

@MikeS I see your line was already there. Any other ideas?

MikeS

@GT1Za first line is not the same...it has X0 Y0 which moves the head to pause position while lifting and is causing your problem. Add the line i told you at the beginning and it should first go 5mm above pause position and then move to where you hit pause. First thing i learn using duet is to give a read at the gcode documentation...it is really worth the time!

GT1Za

@MikeS ahh thanks, I didn't think the x0 y0 would make a difference considering x0 y0 is the front left of my bed and not the center.
I'll give it a try and see.

dc42

I lift the head 5mm in the pause.g file after retracting and before moving to where I want the head while paused. While paused, it remains 5mm above the pause point. Then in resume.g I use G1 R1 X0 Y0 followed by G1 R1 X0 Y0 Z0.

GT1Za

@dc42 would you mind copy and pasting your pause and resume codes?

dc42

@GT1Za said in Resume print:

@dc42 would you mind copy and pasting your pause and resume codes?

; Pause macro file
if state.currentTool != -1
  M83					; relative extruder moves
  G1 E-4 F2500		; retract 4mm
G91					; relative moves
G1 Z5 F5000			; raise nozzle 5mm
G90					; absolute moves
G1 X0 Y85 F10000
;M106 S0

; Resume macro file
G1 R1 X0 Y0 Z2 F5000	; move to 2mm above resume point
G1 R1 X0 Y0 Z0		; lower nozzle to resume point
if state.currentTool != -1
  M83			; relative extruder moves
  G1 E4 F2500		; undo the retraction

GT1Za

@dc42 I have tried to use your script but im still battling with the same issue.

In short, whats happeing is that when I pause, the print head moves to the front right of the bed as it should. I can then do the filament change or whatever is required, but when I resume the print, the print head moves in a diagonal motion to where it left, but often it hasnt reached the required height before it starts passing over the model and knocks it off the bed.
Is there a way to get the print head to only move to the Z height and not xy?
Alternatively on the pause to remain at its current (or slightly raised height) rather than it lowering to the normal starting z position?

For info there is the pause and resume:

Pause:
; pause.g
; called when a print from SD card is paused
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed May 06 2020 11:04:16 GMT+0200 (South Africa Standard Time)
M83 ; relative extruder moves
G1 E-2 F3600 ; retract 2mm of filament
G91 ; relative positioning
G1 Z5 F360 ; lift Z by 5mm
G90 ; absolute positioning
G1 X0 Y0 F6000 ; go to X=0 Y=0

Resume:
; resume.g
; called before a print from SD card is resumed
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed May 06 2020 11:04:16 GMT+0200 (South Africa Standard Time)
G1 R1 X0 Y0 Z5 F6000 ; go to 5mm above position of the last print move
G1 R1 X0 Y0 Z0 ; go back to the last print move
M83 ; relative extruder moves
G1 E2 F3600 ; extrude 2mm of filament

Phaedrux

Can you post your config.g? Do you have other tool offsets?

GT1Za

@Phaedrux here is the config. Left out the networking part

; Drives
M569 P0 S0 ; 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 Z2:4 E3 ; two Z motors connected to driver outputs Z and E1
M671 X-20:220 Y0:0 S0.5 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis
M208 X-5:205 Y0:200 ; X carriage moves from -5 to 205, Y bed goes from 0 to 200
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E408 ; set steps per mm
M566 X500.00 Y500.00 Z24.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z300.00 E3600.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z100.00 E5000.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z900 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y-22.5 Z-2.5 S1 ; set axis minima
M208 X500 Y500 Z500 S0 ; set axis maxima

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

; Z-Probe
M558 P9 H5 F120 T6000 A2 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-30.8 Y0 Z2.55 ; set Z probe trigger value, offset and trigger height
M557 X15:445 Y15:445 S20 ; define mesh grid

; Heaters
M305 P0 T100000 B4138 R2200 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R2200 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M106 P0 S1 I0 F500 H1 T30 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
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

Phaedrux

I don't see anything unusual in there, unless you've got something in the homing files or start gcode?

GT1Za

@Phaedrux I really dont think its the start code haha... but for safety sake here it is:

G28
G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up
G1 X10.1 Y20 Z0.28 F5000.0 ;Move to start position
G1 X10.1 Y200.0 Z0.28 F1500.0 E15 ;Draw the first line
G1 X10.4 Y200.0 Z0.28 F5000.0 ;Move to side a little
G1 X10.4 Y20 Z0.28 F1500.0 E30 ;Draw the second line
G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up

GT1Za

S5 V2.mp4

@Phaedrux @dc42
Sorry guys I thought maybe a video to show this is the easiest.

As you can see, when you hit resume, the nozzle drops from the correct height to resume, to x0 y0 z0 and then starts moving to go back to the resume point. This almost always knocks the print off the bed... How do I correct that?

G1 R1 X0 Y0 Z5 F6000 ; go to 5mm above position of the last print move
G1 R1 X0 Y0 Z0 ; go back to the last print move
M83 ; relative extruder moves
G1 E2 F3600 ; extrude 2mm of filament

Phaedrux

@GT1Za Is the video supposed to be only 3 seconds long? Though it looks like it's moving at a diagonal.

Again, I ask what firmware version are you using? Send M115.

GT1Za

@Phaedrux sorry I missed you asking for the firmware.
The video was only 3 seconds because the forum will only allow a 4mb upload.

Firmware is 2.02RC5

Phaedrux

@GT1Za said in Resume print:

Firmware is 2.02RC5

I would suggest updating your firmware first. There were some issues in that time frame for resuming.

https://github.com/Duet3D/RepRapFirmware/releases/download/2.05.1/Duet2Firmware-2.05.1.zip

Download this zip file, and in DWC, upload it to the system tab. Don't extract it first.

GT1Za

@Phaedrux the reason I havent done this is because, well as you can see im not the greatest at firmware. My understanding is that most of the code for the config etc has changed? If I upload this wont it break my existing?

Phaedrux

No, 2.05 won't require changes to your config. RRF3 would require changes.