Prusa Slicer Bug causes bad prints on MK4 - Hardware, firmware and software help

RE: Prusa Slicer Bug causes bad prints on MK4

Simon Tratter — Fri, 27 Oct 2023 21:30:59 +0000

Re-exporting it as a new step or 3mf file didn't helped. It just relocated the problem to another corner :(
Simon

RE:

Simon Tratter — Fri, 27 Oct 2023 21:22:07 +0000

Here are my files. One is the original Fusion 360 file and the other the 3mf file.

I designed this myself in Fusion 360. The "Bug" I showed in the video I linked in my first post shows the issue. It happens between layer 11 and layer 36 using 0.15 z-height

Simon :)

RE: Prusa Slicer Bug causes bad prints on MK4

FoxRun3D — Fri, 27 Oct 2023 15:56:50 +0000

You can also upload the zip-compressed 3mf file here, so we cam check the model and your settings.

RE:

TeamD3dp — Fri, 27 Oct 2023 15:41:15 +0000

I'm far from being an expert, so it could still be slicer related...but if you are only having trouble with this one model, I would look to the model itself before anything else. Did you create the model yourself or download it? If you have the ability to inspect the model in design software and possibly re-export to step or stl, it might resolve the issue.

-J

RE: Prusa Slicer Bug causes bad prints on MK4

Simon Tratter — Fri, 27 Oct 2023 14:08:05 +0000

I am using the latest firmware and latest prusa slicer (not the alpha). Input shaping was enabled. Interestingly other models work really well with PETG. It's just this model, which is not working well.
Simon

RE: Prusa Slicer Bug causes bad prints on MK4

Steve — Fri, 27 Oct 2023 13:39:35 +0000

I have several questions:

1) Are you using the latest version of the firmware (with input shaping) and the latest version of Prusaslicer? Input shaping may help your issue.

2) Did you report this on Github? If you didn't, you should. That way, it will get fixed.

I get great prints using PETG on my MK4.

Steve

Prusa Slicer Bug causes bad prints on MK4

Simon Tratter — Mon, 23 Oct 2023 19:58:07 +0000

My MK4 is not printing very well recently.
I first printed the part with the 0.2 structural input shaper profile. It was bad. Ringing and small imperfections. Then I tried again with 0.15 speed and it was better at first. but got worse on espacially one spot.

I noticed this "prusaslicer bug" during printing:
The printhead finished his external parimeter on the front left corner, then for no reason he moved to the front right corner and moved down as if he wants to extrude (But he does not extrude there and I checkt in the slicer and there is also no extruded filament). But then is the layer change and he moves to the top right corner to start the new layer. This means the print head needs almost 3 times longer tp reach the top right corner instead of moving diagonal which is way faster. And because he needs almost 3 times longer for the travel move, the filament has enough time to ooze out of the nozzle to create the hole in the third picture.

Here is a video where I show the problem the slicer creates:
https://storage.googleapis.com/prusa3d-content-prod-14e8-wordpress-forum-prod/2023/10/4461b266-aufzeichnung-2023-10-23-214923.mp4