A simple test to investigate printing tolerances, based on Brad Tallis's video here: https://www.youtube.com/watch?v=rUo3mNhCzkU .
The top-left hole on the board (top-left is where the notch is) has 10.00mm diameter, going right and then down the diameter of each hole increases by 0.05mm. So first row is 10.00, 10.05, 10.10, 10.15 and the second row is 10.20, 10.25 and so on.
The tip has a small chamfer but then it has a diameter of 10.00mm.
The author marked this model as their own original creation.