When the use case of a model means that dimensional accuracy is important, you need to know what error is introduced by your slicer and printer, and learn how to calibrate the model and printer to compensate.  You also need to understand how the different file types behave and different levels of refinement that are available.

I made this model for my own use as a learning exercise, but also for the calibration of my own printers and slicer.

Printing Parameters:
a) Nozzle Size > whatever suits your model use case.
b) Line Height > whatever suits your purpose
c) Slicer Settings: I suggest that dimensional accuracy of your printer and material needs to be calibrated first, before this model is applied to help with holes.
100% infill is suggested. Supports on or off as you like. **

d) Material: Plastic filled with Carbon Fibre, Glass Fibre or (other fibre) will likely print with greater dimensional accuracy than plastic with no fill.  But the best material to use will be that which you need to complete your project.
For a level playing field, to eliminate filament shrinkage as a factor for evaluation, I use Prusament PETG CF, but PA11CF or PC Blend CF would also work.

Further discussion:
The model has sets of holes aligned  with  X, Y and Z planes. You can observe the effect on gross interior diameter, and on the degree of hole ovality.  The holes are modelled as circular, if they print oval, then that's an error.

I've supplied the model in both STL (Mesh) format and in STEP format.  A new feature in Prusa Slicer 2.9.2 allows you to vary the slicing quality for STEP files, but not STL files.

• STL files will nearly always print with a shrinkage of 0.2 mm or more.  And such shrinkage needs to be corrected in the modelling tool.
• (I found) that the amount of shrinkage for STEP files will vary from 0 to 0.35 mm depending on the hole size and orientation, and the amount of detail allowed when the step file is imported.
  
  ** Supports: If supports are set to automatic, Prusa slicer will always add supports on  vertical holes.  But you will also find that circular holes can be printed without supports (and they seem to come out ‘ok’), but the uppermost edge of the hole may be marred.