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Dimensions in printed model does not match all dimensions in stl

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I just printed my first model with an Ultimaker 3 with PLA and a layer height of 0.1mm, no supports. The printer is calibrated (x/z and z). The model is simple wheel for a robot which has to be attached to a stepper motor.


When measuring the outer dimensions of the wheel, the dimensions of the design and model match.

But the hole in the middle is 3.01mm x 5mm in the design, in the printed model this is 2.4mm x 4.4mm.

Is this expected and should i calculate a scaling factor due to shrinking of materials ? Or is there another issue i should fix ?

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