To get a perfect cutting accuracy, it is important to set the correct offset and replace the knife in case it is worn.
If the correct offset has been entered into the machine and you are using a new blade, the test cut should appear like the above diagram, the circle should be perfectly aligned and the corners of the square should be at a right angle.
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If the blade is worn you may see a test cut like the diagram, you can try to adjust the offset value on the machine to compensate for this, however the only solution for this is to purchase another blade. Blade wear will vary on how much you use the machine. This problem could also be becaused the blade holder is wear.
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