Circle fit test sticks.

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Will it fit? Let's investigate. With these tools, you can preview what your printer will produce before adding holes to your design. Do you require a loose fit or a snug one? Perhaps a hammer fit would be suitable? Maybe you want to create a hole that a bolt can thread into seamlessly? These test sticks increase in size by 0.2 mm per hole. For instance, the first stick features holes of 6, 6.2, 6.4, 6.6, 6.8, 7, 7.2, 7.4, 7.6, 7.8 and 8mm diameters. Consequently, you can find any type of fit for round objects ranging from 6 mm to 18 mm with these tools at your disposal. Don't bother printing them until your printer is properly calibrated, though. Simply write the sizes on them using a marker. This is an essential tool, not a test print.