Messed up print

[Sanyi]

Hello

I have bought two Creality printers and set them up side by side in the same room, on different tables next to each other. One is working fine, the other is not. They are both Ender-3 S Plus.
Here is a picture of the printer job in progress that is going okay on the good printer:

And here are some pictures of the job on the other one, that is messed up:

It looks like the problem is caused at these hard bunches of filament that prevent the head from moving if it runs into them and the machine looses position:

They both use the same filament:

and both use these same settings:

What is going on? Can anyone offer a suggestion?

Thanks in advance.
Sanyi.

 

[Sanyi]

Well, while waiting for a response, I investigated further, and behold, it seems the nozzle was not tightened properly at the factory. It leaked the melt out on its side.

I started a new print with it torqued down, and will post results, for anyone in a similar situation.
Bests.

 

[Admin]

How did the last print go? Did that fix it for you?

 

[Sanyi]

Yes, it did. I meant to come back here sooner and tell you guys, but, ya know, life ....
Anyway, yeah, that was it. The printer is happy now.

But I have another question to ponder, if you have the bandwidth. The nice magnetic sheet on the platen has a really good black-coat surface to print on, in fact perhaps too good. If the first layer is too thin, the print sticks to it so strongly that when I remove the finished object it rips the coating off and damages it, leaving potholes, not unlike on a road. In the old days the surfaces were not sticky enough, now it's an opposite problem. So, if this happens, how should I remove the finished part without causing a rip in the black coating? Has anyone here experienced this? I guess, the practical solution would be to always pay attention to the first layer and if it starts to thin out, and the thermoplastic looks transparent, just raise the head? Any other pointers?

There is a job in progress on the machine right now, so the pothole is covered up, but after it's finished, I'll snap a picture of it and post it here. (Yeah, the part will have a slight protrusion on its bottom, darn.)

Thanks a bunch.