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Aravindaa Jayawardhana

Size of the 3D print vs Actual size

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I wanted to know that, is there any size difference between the .stl file generated form CT scan and the actual size of the skull of the patient.

at the conversion, is there any dimensional change could be happen in the software. 

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There shouldn't be. Just know that the unit of measurement is in millimeters. If you import the STL file into printer software and specify that the unit of measurement is cm, inches, or feet, your model will be HUGE.

 

Hope this helps.

 

Mike

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Every plastic shrinks a bit when it's cooled down. This percentage is different for the different materials, but it's a good idea to scale up your model in the slicer with 0,05%. Also, some composites have minimal shrinkage and they should be on choice for prints, which requires high dimensional accuracy. I'm using Silk PLA (85% PLA, 15% Polyester, some other additives) with great success, because the shrinkage is lower than the natural PLA. On the graphic I measured a model of Aberrant arteria subclavia dextra - the CT scan with a dicom viewer, the model with Autodesk Fusion 360 and the printed model with vernier caliper. I calculated average deviation on 95% confidence interval and this is what I got. Note that the caliper was too tick and large for subclavia dextra, which resulted in the difference of the result (my tool is too large). I think those results are quite promising and I'm planing to close the circle - to measure cadaver, CT of the cadaver, generated 3D model and 3D printed model, when the ethical commission allow me to.

 

Picture1.png

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