Holes calibration plates: 10-to-1 mm and 16-to-1 mm

There are a bunch of different hole-size calibration plates, but the ones I was missing were - the most basic and fast-to-print models to understand the performance of your printer for inner holes quickly while you are in the middle of your 3D-design.

So, my requirements were:

1. Fast to print: the smallest size and height possible, no size markings (otherwise it takes more time to print).
2. Circle, square, and hexagon alternatives.
3. 16-to-1 mm and 10-to-1 mm alternatives.
4. Meaningful design: you quickly catch the form of holes by observing the form of the object.

Here you go, Holes Calibration plates to check how your 3D printer handles the inner holes in XY-plane.

Tinkercad sources:
https://www.tinkercad.com/things/9JrGkaZGfyQ-holes-calibration-plates-10-to-1-mm-and-16-to-1-mm