core 1 extruder is jumping out of sync.  

RE:

A common cause for sudden, large XY displacements is that "avoid crossing perimeters" is set in PrusaSlicer. There is apparently a software bug which causes invalid Gcode to be written, which incudes large movements with very rapid speed and acceleration, which the tool head cannont follow.

But this is a stab in the dark. We would need a bit more information:

• Is this a factory-made printer or built from a kit?
• Does the printer pass the XYZ calibration and homing tests (called from the firmware menu)?
• Have you checked the belt tension? Most easily done with the new firmware 6.4.0 and following Prusa's most recent guide.  
• Did you slice the model(s) yourself or are they pre-made Gcode? If the latter, where do they come from and are they sliced for the Core One? If the former, it would be helpful if you can upload the .3mf file so we can look at the settings. You will need to Zip the .3mf before uploading, otherwise the attachment type is not accepted. 

Edit: You have set the status of this topic to "answered", I think by accident. Not sure if you can reset that; it might get you more answers.

RE: core 1 extruder is jumping out of sync.

Jugen,

Thank you for the reply and what you are saying about sudden and violent movement is correct. I have been sitting there and when it happens it sounds almost like a gun blast. this when it happens is very violent and then the head follows the part that has moved.

I buillt the core 1 myself and has been running great right from the start. I have been slicing this rc plane through the Prusa slicer. I also have the do not cross set to on. I am rinting a box on it right now to see if it is the machine or the coding. 

 I think that you have hit the nail on the head here because it is printing right now perfectly with an earlier g coded box.

How can I send you the zip file?

Rich

RE: core 1 extruder is jumping out of sync.

I had this same problem happen to me, i believe i solved it. For reference, I just got a c1+ assembled 3 days ago. I am currently printing a bunch of things with Inlands HFABS with a top speed of 350mm/s with the prusa CHT .4 nozzle. I have already calibrated the filament and tuned it for the printer. I am also slicing these prints with orca slicer.

I turned off arc fitting, turned off "avoid crossing perimiters", and i checked the belt tension. Annoyingly, my 1300 dollar printers belt tension, (assembled at the factory) was on the old version at 60-70htz vs what prusa says now needs to be at 98-90htz. I fixed that. 

So far that has solved my problems and my prints are looking fantastic. I would try 4 things

>slow the print speed down

>check xy belt tension

>turn off arc fitting

>turn off "avoid crossing perimiters"

RE: core 1 extruder is jumping out of sync.

Posted by: @rpat

I also have the do not cross set to on. I am printing a box on it right now to see if it is the machine or the coding. 

[...] How can I send you the zip file?

Fingers crossed -- maybe the print will succeed once you disable the "do not cross perimeters", and we have already solved this! 

Otherwise, you can attach files to a post to share them here. Below the editor window where you write your text, there should be an "Attach file:" option.

If you don't feel comfortable publishing the file for everyone, you should also be able to attach it to a personal message to me: Click on my username on the left; on the new page that opens, click the orange "send a message" button in the upper right. You will get a similar editor box and Attach file option. -- But if there are no confidentiality issues, I would encourage you to post it in the thread to make best use of the "hive mind" here!

RE: core 1 extruder is jumping out of sync.

OKI will try and get some of the files that I have sliced on here. These were originally stl files not the other kind that I have sliced.

RE: core 1 extruder is jumping out of sync.

https://drive.google.com/file/d/1RHW_TXAHGJ3kxmkvHy0CYaAvhE98BObW/view?usp=sharing

https://drive.google.com/file/d/1-4Qqj6TLoEELmVMIGjJ_9vgySw6qk4Rp/view?usp=sharing

OK here are two of the files that I g coded on the airplane

RE: core 1 extruder is jumping out of sync.

https://drive.google.com/file/d/1ZMb30MezQ2A1WT0-wKFP3IywzZ3He5dW/view?usp=sharing

This is the stl file that I bought.The flies are on the profile 5 gyroid . The fuselage  files are the ones that are giving me trouble. I think that they are the ones that are corrupted.

RE: core 1 extruder is jumping out of sync.

Actually it was neither the .STL files nor the .BGCODE files that I was looking for, but the .3MF file(s). STL describes the surface of the part, BGCODE describes the movements of the printer (in hard-to-read binary code). 3MF is the PrusaSlicer project file which has all the print settings, including the problematic ones like "avoid crossing perimeters".

While STL files themselves can in principle be corrupted, that will typically result in PrusaSlicer not being able to generate any Gcode from them, because they cannot be rendered and sliced. Or the model may not look like intended, already in the preview, but can still be printed. (Looking as mangled as the preview did of course...) The more likely issue here -- if it is a software issue -- is in the translation from STL to Gcode, and the .3MF file shows how that was done.

Where does your effort to print the problematic fuselage files stand at the moment? Did you already try the steps @salty-prints suggested above, and you still get the layer shifts when you try to print them? If that is still the case, it would be great if you could share the .3MF where you did the slicing for one of the problematic files. 

RE: core 1 extruder is jumping out of sync.

Jurgen,

 I do not know what a 3mf file is. Is that the file that the slicer asks me to save after a transfer my g code to my documents? I have been saving them but do not know where they are going. I am really new to this and I appreciate you giving me your time with this. Where are these 3mf files located?

RE:

Posted by: @rpat

 I do not know what a 3mf file is. Is that the file that the slicer asks me to save after a transfer my g code to my documents? I have been saving them but do not know where they are going. I am really new to this and I appreciate you giving me your time with this. Where are these 3mf files located?

Sorry, I took that for granted. .3MF is the PrusaSlicer project file. It includes your current model (one or more STLs placed on the print bed), as well as all the printer and filament-related settings you use for slicing it. You can save the project from the file menu.

Of course it is possible to use PrusaSlicer without ever saving a project: Just load an STL, select the filament and maybe change some slicer settings, slice, print, done. But for complex models which push the limits of the printer, I recommend that you save the .3MF file. Then you can go back to it if the print does not come out quite right, check the settings you used, and try to optimize the print quality by making some targeted adjustments. Or you can share it with others and ask them to "look over your shoulder" and provide suggestions.

Edit: When you save a newly created project file for the first time, you should get the regular Windows file selection dialog. So you determine where the file is saved.

RE: core 1 extruder is jumping out of sync.

https://drive.google.com/file/d/1ML_nePjDbd-_lrnLTe10y3ltIuuZ_bc4/view?usp=drive_link

https://drive.google.com/file/d/1SpueGO5yjLTXeDDZuT4wHd_fCmn-wfI1/view?usp=sharing

OK Jurgen here are the 3mf samples that you can look at......I THINK......lst me know .....

RE: core 1 extruder is jumping out of sync.

Yes, that worked nicely!

I see that you have "Avoid crossing perimeters" still turned on in your print settings, in the "Layers and perimeters" section. What happens if you try a print without this option checked? It is known to create Gcode with those impossible moves sometimes. I am still hopeful that disabling it will solve your printing problem -- fingers crossed!

(The description of the print settings is a bit unclear there. The item just below, "Avoid crossing perimeters -- max. detour length" says in its note on the right "zero to disable". But I believe that only disables the limit on the detour length, i.e. the print had will move whatever detour distance it takes to avoid crossing perimeters. It does not disable the "Avoid crossing perimeters" mechanism itself; that needs to be done by the checkbox above.)

On a more general note: I see that quite a few print settings were changed from their default values. Did the designer of the model recommend all these settings in detail? Then it's ok to leave them in place, I guess. Otherwise, a single-layer vertical perimeter (i.e. a wall thickness comprising a single line of filament) looks a bit marginal to me. It will not produce a very robust model, and the infill structure might be slightly noticeable from the outside. You could increase this to the default value of two -- at the expense of somewhat longer print time, a heavier model and mode filament used.

I also notice that you are printing in "0.2 mm SPEED" mode. Is that recommended for the model? It implies some compromise in the rigidity of the model and the accuracy of sharp corners. So maybe "0.2 mm BALANCED" is justified, although it will take longer to print. 

RE: core 1 extruder is jumping out of sync.

Jurgen, 

  I took out the avoid crossing perimeters and a couple of small changes and it is printing great now. You were 100% correct on that call. Thank you very much for your help on this.

Rich Paterra