Eliminating M109 calls when changing tools/shared heater

[Balbers01 0]

I have a 3 in 1 out extruder with a single heater and in cura I have shared heater checked.  My issue is that every tool change there is a M109 to set the temperature which triggers the warmup delay (all filaments are the same temp) and yields significantly longer print times.  Is there any way to eliminate these temp calls on tool change and just let it stick with the initial temp?  I've watched during the change and the temp stays steady at 200 degrees even before the call is made.  

[burtoogle 514]

Hi @Balbers01, could you please provide a project file that has this problem? Do File->Save and attach the .3mf file to this thread. THanks.

[Balbers01 0]

Attached.

CFFFP_gearstem_c.3mf CFFFP_gearstem_c.gcode

[burtoogle 514]

Nozzles 2 and 3 have a standby temp of 175, you need to make it the same as the print temp.

[burtoogle 514]

Actually, I'm not sure that is the issue, I'll look some more.

[burtoogle 514]

It wasn't the standby temps causing the issue (they are ignored) it was a bug in the shared heater code. I will submit a fix to be included in a future UM Cura release. In the meantime, I will put the fix into my next Cura build if you care to use one of them. You can find my builds at https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0

Please read the README.md file there before using. What system are you using?

[Balbers01 0]

I appreciate the help, when will the fix be implemented in your build?  Thanks!

[burtoogle 514]

It's done already, the 20200703 release has the fix.

[Balbers01 0]

Thanks, just installed it and did a test run, doesn't export the temp calls.  going to run a test print this week.

[DanielP5433 0]

Hi,

 

I would just like to start off by saying thank you for all the work you have done, I am having a similar issue but instead it is with an IDEX system.

 

When I check the generated G Code files it puts a M109 and M 104 in after the start G Code which also has a M109 and M104 command. Since I have an IDEX machine (Leapfrog Bolt Pro) I want it to heat up, purge, wipe then start printing. My start G Code looks like this (I am still not sure how to set print and stand by temps as per slicer settings so I put it in manually)

 

M109 S252

M104 T1 S175

G1 Y-33 F12000 ; move to wipe Y position

G91 ; set to relative

G1 E15 F150 ; extrude 15mm

G4 S2

G90 ; set to absolute

G92 E0 ;zero extruder

G1 X290 F12000 ; perform wipe sequence

G1 X367 F12000

G1 X290 F12000

 

The gcode generated after slicing does this at a tool change

T1
G92 E0
M109 S240
M104 T0 S175
G1 Y-33 F12000 ; move to wipe Y position
G91 ; set to relative
G1 E15 F150 ; extrude 15mm
G4 S2
G90 ; set to absolute
G92 E0 ;zero extruder
G1 X20 F12000 ; perform wipe sequence
G1 X-20 F12000
G1 X20 F12000
M105
M109 S240
M104 T0 S175
M106 S127.5
M205 X30 Y30
G1 F2400 E-1.5
G1 F600 Z3.3

 

I have underlined the second commands as the machine pauses to heat again, allowing material to ooze out defeating the purpose of the wipe and pure. Any help is greatly appreciated!

[burtoogle 514]

I believe that if the start code contains some magic keywords then the temperatures will not be set again by Cura. Have something like this in your start code...

 

        M104 S{material_print_temperature}
        M109 S{material_print_temperature}

 

[DanielP5433 0]

Thanks so much, I changed my start gcode so now it performs better but it still sets M109 twice when selecting T1 extruder. I uninstalled Cura completely and installed the latest mater build you shared in the link on this thread but still no luck. Any other ideas?

[burtoogle 514]

Could you please provide a project file? Do File->Save and attach the .3mf file to this thread. Thanks.

[DanielP5433 0]

I have attached it now, The main issues I am having are the M109 and M104 replication but some advice on start gcode for each extruder to do a retract after the purge/wipe, move to print position then prime back retracted amount before printing would also be amazing. It seems to do it in the G code at the start before the skirt but won't do it after a tool change, also if this takes up a significant amount of you time please let me know your pay pal so I can pay you for your time.

Styram 1.3mf

[burtoogle 514]

Thanks for the file, don't worry about paypal, I do this for fun! However, I only actually do single material prints myself so I'm not at all knowledgeable about tool changing so maybe someone else who has some experience with that can comment?

[DanielP5433 0]

No problem, thanks again! Hopefully you can find something with the M104/M109 codes and I will create a new post for help with the tool change.

[burtoogle 514]

With this start g-code...

 

; start g-code

M104 T0 S{material_standby_temperature}

M104 T1 S{material_standby_temperature}

G90

G28 X0 Y0 Z0

G1 Z5 F1000

G92 E0

G1 Y-32 F12000

G1 E15 F800

G4 S5

 

I now get...

 

;FLAVOR:Marlin
;TIME:42781
;Filament used: 27.227m, 4.76933m
;Layer height: 0.2
;MINX:128.132
;MINY:88.46
;MINZ:0.3
;MAXX:178.225
;MAXY:233.54
;MAXZ:103.35
;LINEARADVANCEPROCESSED
;Generated with Cura_SteamEngine master
T0
M140 S60
M105
M190 S60
M82 ;absolute extrusion mode
; start g-code
M104 T0 S175
M104 T1 S175
G90
G28 X0 Y0 Z0
G1 Z5 F1000
G92 E0
G1 Y-32 F12000
G1 E15 F800
G4 S5
G92 E0
; right extruder
M109 S255
M104 T1 S175
G1 Y-32 F12000 ; move to wipe Y position
G91 ; set to relative
G1 E15 F200 ; extrude 15mm
G4 S2
G92 E0 ;zero extruder
G1 X290 F12000 ; perform wipe sequence

...

 

So the first m109 is when it selects the first extruder. Is that any better ?

 

[DanielP5433 0]

Do you mean machine start or tool start?

 

It looks great but I'll check what it does at a tool change to see if it fixes the issue there as well. Get back to you soon.

[burtoogle 514]

Machine start, I didn't change the tool start codes.

[DanielP5433 0]

Ah, OK then, I think the issue is mostly at tool change but I will check now and see how it goes. Thank you again!

 

[DanielP5433 0]

It's still playing up so I'm going to roll back to an earlier version to see if it's something with cura. When swapping to T1 it still will duplicate the m109 command but it retracts before going to print. With T0 it won't duplicate the M109 but won't retract. Really strange, I made another post but no reply yet.

[rburema 26]

The fix that @burtoogle made for the OP has been deemed low risk enough that we'll try to get it in 4.7, a beta of which should be out relatively shortly.

[DanielP5433 0]

That's awesome thanks so much for the response!