Print this model with whatever filament you like, with the same amount of perimeter layers that you would print your other models with.
Holes are layed out from left to right. Starting with 0mm (no hole) at lower left, then going up 1mm per row, and 0.1mm per column. Largest hole is 10.9mm
This can be used to check print tolerance, ie, design to fit a 4mm hose for instance, you might need to set a hole to be 4.3mm to fit a 4mm hose when printed. Use the test holes to match with the item that needs to fit, or test with a drill bit as calibration.
The author hasn't provided the model origin yet.