Printing the presliced Buddha that Elegoo distributes is a good test as its known good gcode for the Neptune 4 that's been calibrated for Elegoo's PLA Filament.
If you're not using a filament with and already defined filament profile it's recommended you calibrate a profile for it as it will result in improvements over using any default profiles (which are more of a suggested basis to start from.)
Orca slicer offers excellent calibration tools for determining common filament parameters. These can and will vary between the filament you're using, even with respect sometimes to filament color.
For calibrating flow rate, I prefer the following calibration test over the Orca test as it’s less subjectively focused and more functionality focused, uses way less filament and prints quicker: https://www.printables.com/model/1113488-flexi-flow-calibration-tool-v4-by-ck3d
Use your slicer to create a primitive object, a cube, and slice it with your test slicer settings and try to print it.
Learn to use Orca Slicer
Perform Orca Calibrations to build a filament profile for the specific filament you will be using. These filament profiles will vary between material (PLA, PETG, TPU, ASA, ABS, …), type (standard, high speed, high temp, plus, “silk”, matte, …), brand and even color.
Do not tighten or adjust the lock nuts for the lead screw couplers to the gantry. They are set at the factory (lock nuts) and need to be loose. Adjusting lock nuts damages them.
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