The bed is level. The first layer still fails.
Most hobby printers do not fail because the model is bad. They fail in the first 0.2 mm.
A “level” bed that is 0.1 mm too far on one corner will look fine until layer 3, then the part lifts. A nozzle that is 5° too cold will look like under-extrusion. A dirty PEI sheet will look like a bad STL.
Before you reprint the same file:
Clean the plate with dish soap, not IPA on every brand of sheet.
Run a 1-layer 20 mm square, not a 4-hour print, to read the gap.
Watch the first 30 seconds of extrusion — if it is transparent or stringy, stop. Heat and Z-offset beat more infill.
If the machine still will not hold a first layer after that, it is a setup problem, not a file problem. Fix the machine. Then print the file.