From the look of your calibration prints you really do have poor bed adhesion and from the pictures of the larger pieces you also seem to have interlayer adhesion problems. together these suggest your problem is either too low a print temperature for your filament or just dodgy filament. You don't say what material you are using. We recently did controlled tests on 8 filaments 3 ABS and 5 Nylon materials of these we found only 1 of the ABS filaments and 3 of the nylons could be made to print reliably in our set up. We tried all of them with multiple print bed materials as well.IPA Isopropanol can often be obtained from a car paint shop supplier but does tend to dissolve grease and spread it around rather than completely remove it so you need several goes with a rewetted cloth. I personally use acetone (not nail varnish remover) for bed cleaningIf you are thinking of using ABS for your project else where in this forum I have given some fairly detailed help on how we use it in a lab situation based on an Ender 3 Prohope this helps