hello i just got a 3d printer creality 3 v2 and when i print it prints part of the model then it becomes stringy why i leveld the bed ? i use pla temp 210 and bed is 70 c and print speed was 100 i now turned it down to 50 to see if that helps
Judging from the pic i think you have made several mistakes. I havent done 3d printing for a while but i’ll try my best to help ok 
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Looks like Your build plate adhesion setting was skirt change it to brim, add support if needed.
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If you use PLA/PLA+ material & you have “magnetic bed” you can turn off heating on the bed. This may reduce your electricity bill since the bed heating eats a lot of electricity.
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Check your bed leveling once again
i fixed the issue all i had to do was lower the speed of printing it was set to 100 i set it to 50
budt i have a new issue i was printing a german sheperd sitting down and it took hours as the model was so big and when it was about to connect the body with the front legs the front legs wasnt sticking to the bed and messed em up why do i need to heat up the bed something like 90 c they where on 70 c
Slicer makes a difference. I always used Cura, and had many failed prints. Now I use Prusa and, touch PLA, not had a failure since.
yeah medium speed is ok
I told you as long as you have magnetic plate dont heat the bed
anyway here is a good youtup channel for 3D printing especially filament 
https://www.youtube.com/@FilamentFriday/videos