trouble shooting 3d printer

[Bere.]

Hello, I'm new to these forums and also new to 3d printing, so I don't know a lot.
about a month ago I bought a ender v3 pro, which I heard was the best cheap 3d printer. I printed 3 things and worked fine, a bit of trouble with leveling but got the hang of it. I tried to print a 4th thing but no matter what I do it doesn't stick to the mat, I've replaced the mat with a metal one and the nozzle and also the extruder fan because I heard a broken one can stop it from sticking and mine was broken. but nothing worked, I was hoping someone could give me advice on what to change or something, Anything advice helps.
Im printing with a ender v3 pro, metal mat, PLA that came with the printer, at 210°

[MarkPol88]

Welcome to the forums!

Well, I am nowhere near the expert on the 3d printers but when someone who is will show up they might be missing few details:

- what is the temperature of bed? or is it without heating?

- what slicer are you using and what are you printing? (post a screenshot if you can)

- are the failed prints of the same 3D model as earlier, successful ones?

 

From your description it might look like standard first layer problems but more information is needed.

[TVwazhere]

11 hours ago, Bere. said:

 I tried to print a 4th thing but no matter what I do it doesn't stick to the mat, 

The most common reason I see is people forget to change their Z offset on the printer. 

 

 

[ObsoleteTech]

I have an Ender 3 S1 pro and have worked as an AM/3D engineer for some years.

 

In the menu where the leveling is you have an Z-offset adjuster.

 

If you have the bed sort of leveled now you should stick a peice of paper in between the nozzle tip (clean) and the bed, then lower Z-offset until it is stuck, the rise it until there is some resistance but not mutch, there you have the Z-offset done.

 

The stock PLA is rubbish but it should be printable. 

210C on the nozzle should be just fine, 60C should be good on the build plate.

No fan should be running on the first one or two layers, you really wan't the heat do go down.

PEI-coated or Garolite is the best build plate for PLA, if you use clean metal or glass some glue or hair spray might be needed to get it to stick.

I always use 0,2mm on my first layer, i have got the best results that way.

 

What and where are you printing?

Small things migt need a brim, some extra lines to increase the bottom surface area.

 

All open printers are wery sensitive to temperature and drag, just minor wind or temperature change can make a print fail.

 

I acualy hade a picture somewhere of a long PA-Print where it it visible when the prodution stopped and the teperature in the factory plummited, the beautiful slick white print got uneven and yellow, eventually separating in the layers, when the day shift came back, the same thing happened, in reverse.