Something to keep in mind when modelling for 3d printing, you can model in meters and export the .stl at the appropriate size for your printer software. .stl files are unitless, so it’s only a matter of understanding what your software is working with to know how to export your .stl files.
There is also The Dave Method, which came about long before 3d printing and .stl files were relevant, so it is more useful for modelling small things in large models.