[PETG Settings!?]

thanks for this in depth reply, interesting!

maybe i have something for you too, it's blob prevention. when do blobs occur? in my opinion when the printer has micro stutters due to too many commands per second. the printer stops for a split second but the extruder extrudes at a constant speed, and a blob is created. this mostly occurs at round surfaces with very high detail. i found a setting in cura wich helps to reduce the commands per second. see image below. so if a curved line of 0,5mm has less deviation then 0,05mm, then it's considered a straight line. so the difference is neglectable but it removes all the blobs.

hope this helps you too.

best regards

[PETG Settings!?]

6 hours ago, geert_2 said:

speed 25...30mm/s

i'm curious, why do you print so slow?
i guess because you don't use cooling, it has time to cool?

[PETG Settings!?]

try 235 nozzle, 70-90 bed (higher temp gives better bed adhesion) and fan 30%

those are the most important settings, you could play with retraction distance (2-7mm) and speed (25-50mm/s)

the petg i use is Verbatim black and even at 180C it stil prints but looses it's gloss and has bad layer adhesion, so it has to shine at least. petg always strings a bit but i love it way better then PLA

[Start heating bed and extruder and level bed at the same time]

yep, just checked it works, NICE!
 

the bed and nozzle heat up at the same time, nozzle pre-heats to 180C and after the bed reached the set temp then the nozzle heats further to set temp.

 

thx ahoeben for the help!

[Start heating bed and extruder and level bed at the same time]

FYI this is what cura sends before the start gcode:

;FLAVOR:Marlin
;TIME:271
;Filament used: 0.300314m
;Layer height: 0.3
;MINX:64.694
;MINY:55.895
;MINZ:0.3
;MAXX:175.983
;MAXY:177.194
;MAXZ:0.3
;Generated with Cura_SteamEngine 4.8.0
M140 S70
M105
M190 S70
M104 S245
M105
M109 S245
M82 ;absolute extrusion mode
; Ender 3 Custom Start G-code
G92 E0 ; Reset Extruder
G28 ; Home all axes

 

i checked the meaning of the gcodes on : https://marlinfw.org/meta/gcode/

 

M140 - Set Bed Temperature

M105 - Report Temperatures

M190 - Wait for Bed Temperature

M104 - Set Hotend Temperature

M105 - Report Temperatures

M109 - Wait for Hotend Temperature

 

i see now that M109 and M190 is used for the wait command.

so i think it should be something like this:

M140 S{material_bed_temperature}

M104 S180 ;pre-heat to 180C

M105 ;not shure if this is necessary

M190 S{material_bed_temperature}

M109 S{material_print_temperature}

M82

[Start heating bed and extruder and level bed at the same time]

 

 

hi Ahoeben, thx for your reply!

 

23 hours ago, ahoeben said:

Where did you get the "_wait" from? It is incorrect. Use this instead:

 

i got it from the link you gave higher in this thread: 

On 1/29/2019 at 3:27 PM, ahoeben said:

And in case you are wondering if there are more variables, there are (lots of them):

http://files.fieldofview.com/cura/Replacement_Patterns.html

 

i must say with the _wait it waits untill the temperature is reached, without it it sets the temperature and does a g28 immediate (while still cold)

 

23 hours ago, ahoeben said:

I'm guessing you mean the Gcode? You can save the generated gcode to a file on your disk instead of sending it to the printer directly, and then inspect that file in a texteditor such as notepad.

 

you are absolutely right, that's so stupid of me, haha. thx

 

any idea if it's possible to let them heat together?

[Start heating bed and extruder and level bed at the same time]

is there by the way a way to see all the code that is excecuted by cura (that we can't see) before the start gcode?

[Start heating bed and extruder and level bed at the same time]

i really like this post and wanted to try to let the hotend and bed heat up at the same time, but with those lines above i can't get that to work. i tried different order and with and without _wait but even when is set the nozzle first and then the bed with wait like below, the printr still heats the bed first and wait with heating the nozzle.

i just want them to heat together. 

and if we want to make it really good, only pre-heat the nozzle to for example 180 degrees

or set a time delay for the nozzle heat up before they heat together, so they reach goal temperatures approx. at the same time.

that would be great, anyone knows if any of this is possible?

M104 S{material_print_temperature} T0 ;
M140 S{material_bed_temperature_wait} ;