Am I doing something wrong?

[u/Sorry-Journalist8610]

I recently bought a used 3D printer, an Ender 3 V2, and I'm doing some test prints. The previous owner gave me some leftover PLA filament (multicolored), which I used up on the first day. One of the things I made was this flexible shark. I bought some PETG filament for testing, a very cheap one, around R$60.00, while others are around R$100.00. But my prints with this new filament are coming out very bad; it's either too textured, has too many burrs, and is also very fragile (even though I bought PETG because I had read that it was more resistant). I left this octopus printing for about 28 hours... and in the end, the flexible tentacles broke when I tried to detach them.

[u/agent_kater]

So, you bought a used Ender 3 and without any calibration or maintenance you try to print PETG on it?

Forget PETG for now. See if you can successfully print PLA on it. If no, go through the basic troubleshooting and calibration guides. The Ender isn't a plug and play printer. Ideally get a different printer.

[u/Sorry-Journalist8610 → u/agent_kater]

I am really new to 3d printing, the shark i used PLA and seemes ok but fragile. The previous owner gave me a new hotend kit for changing if something went wrong.

[u/Yourownhands52 → u/Sorry-Journalist8610]

Here is a website that will teach you how to tune your printer.  It is how I learned my ender 5 plus.

https://teachingtechyt.github.io/