Keep having issues with my mk3s  

Keep having issues with my mk3s

Hey guys,

I keep not being able to get a correct print on my Prusa mk3 (and this is getting me very sad).

Recently, I've had layers shifts, I cleaned / greased all axis, did a few new prints and was happy

Then today, I decided for a slightly bigger / longer print. And baam catastrophe hit again, just like before.

This is what I had when I stopped the print: https://photos.app.goo.gl/xksLJGzUk13DxnYC8

First layer is good, I'm using prusament neon green, with std (0.2 Quality) prusa slicer parameters

Since my paranoia is running high, I have a full stream / recording:

You can see at when things start being bad (it's at 23:15 : one extrusion did not stick to the previous layer and made this "string")

From there it goes from bad to worse :more strings, and eventually layer shit. I suspect extruder issues, but I did a cold pull (clean), swapped the small pipe, and my gears for extrusion are clean.

At this point, I'm a bit at a loss, I've had way more failed prints than successful, I'm not sure what to do any more.

Any help welcome, I can share the design / gcode but it's pretty irrelevant since I've had issues on ~all my prints, so it looks more like a mechanical issue than pure software.

I suspected non flat bed, but my first layer has good adhesion, so I rules this one out.