Anycubic Kobra 2 Max profile

[Craigwm 0]

Hello, I am in need of a profile to start off with for a Anycubic Kobra 2 Max. I am able to print the demo pieces right out of the box with the preloaded models but any of my models seem to fail. My guess is that I have the profile set up wrong.

 

Below is what I'm running at the moment. Thanks in advance.

 

[Slashee_the_Cow 410]

Do you have the correct nozzle size (top of the "Extruder" page) entered? Most printers come with a 0.4mm nozzle.

[Craigwm 0]

22 hours ago, Slashee_the_Cow said:

Do you have the correct nozzle size (top of the "Extruder" page) entered? Most printers come with a 0.4mm nozzle.

Thanks!, I have that updated but still running the same issue of the printer not printing well. I have the temps set the same as the test model that printed nicely. 

[Slashee_the_Cow 410]

Any chance you could upload a Cura project file, the gcode for, and a photo of something which didn't print well? See if we can find a link between them.

[Craigwm 0]

On 8/28/2024 at 9:02 PM, Slashee_the_Cow said:

Any chance you could upload a Cura project file, the gcode for, and a photo of something which didn't print well? See if we can find a link between them.

D6_V1.3mf

Here you go. These are 2 different tries. The D6 is the project I tried to print, while the test squares are the gcode that I generated to test with. Both of these are having the same issue.

 

Thanks!

-Bill

V4_30x30x5_mm_Test_Square.gcode

Edited September 2 by Craigwm
Providing more information.

[Slashee_the_Cow 410]

Okay, so what first jumps out at me is:

Holy cow!

That's fast. Too fast. Way too fast. Most PLA is designed to be printed at about 60mm/s. Sometimes I go down if I have intricate details. Even special "high speed" PLA usually isn't rated for above 250mm/s and the only reason I see anyone using it is for participating in the pissing contest amongst Chinese printer manufacturers to print a Benchy the fastest. Even then, while I don't have experience with high speed PLA, I have some "fast" TPU (I liked the colour, not the "fast" part) and that prints best at the same speed as regular TPU.

 

Now you don't have acceleration control on... this worries me, given how fast printers accelerate these days mostly for the aforementioned pissing contest.

Yep, just as I worried. Accelerate too fast - especially to warp speed - and your filament can't dry before being dragged along by the print head (especially at lower flow, like short layers with narrow lines). Personally I'm a bit conservative and limit acceleration to 500mm/s² but the highest acceleration I'd ever recommend is 1000mm/s². Too high and it's possible for the motors to slip and lose a step causing layer shift (higher layers don't get printed exactly above what's already there)... especially depending on your jerk...

That's actually a reasonable default. I'm overly cautious (and usually run at about 8mm/s, or lower for detailed stuff) but that's my paranoia so the default here should be alright. If you're noticing poor quality especially at corners though, try lowering this.

 

Looking at your other settings they seem pretty alright. Quality > Initial Layer Height should be 0.2mm if you're using a 0.2mm nozzle - the general guideline is layer height shouldn't exceed nozzle diameter. Technically Cooling > Minimum Layer Time should be longer but on this print it doesn't matter.

 

So in summary:

• Slow it down. Set the speeds for everything to 60mm/s. Infill the default is usually twice the speed so if you want to set that faster to save some time, you can, but don't go above 120mm/s. Initial layer should probably be about half that.
• Lower acceleration. Acceleration too fast just causes inaccurate prints and sometimes failed prints if it's fast enough to stop filament adhering. I'd lower it to 1000mm/s², max. Same for the initial layer, make it half.
• Less important, but lower that initial height to 0.2mm. To aid adhesion, it's usually more common to increase Quality > Initial Layer Line Width to around 150%. That works better than layer height anyway since it's more area on the build plate.

Yes, this is going to make the print take a lot longer. But don't forget Slashee's Golden Rule: Slow print > bad print.