Hollow print. Help.

[Airkout]

Hello all.
I recently bought my first 3D printer (Ender 3Pro) and I have some problems , tried to print a telescope mounting for a phone but the print came out not too good , kind of flimsy ,and not what I had expected or hoped. (White) .
I said it's probably the supplied (from the company) sample PLA and switched to a reel of real filament PLA standard 1.75 thickness , and tried a print for a friend but the layers still weren't quite sticking to each other so i bumped the nozzle temp up by 5 C. and it kind of worked after some time but not really .
Any ideas on what is wrong or how to fix it??
Anything helps , thanks in advance
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