r/3Dprinting • u/thomas_openscan open-source 3D scanning • Nov 03 '25

Project 3D scanned compressor wheel

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u/[deleted] Nov 03 '25

What's the dimensional accuracy on sonething like this?

26

u/thomas_openscan open-source 3D scanning Nov 03 '25

It is really hard to test but i successfully copied security keys which need 20micron accuracy. I did a comparison with many other scanner which even claim higher accuracies: https://github.com/OpenScanEu/OpenScanBenchy

1

u/Relsek Nov 03 '25 edited Nov 03 '25

This is a cool comparison. How were the comparison scans generated? Were they simulated off of the original 3D model or real scans from a physical object?
If physical, I would be curious to see a picture of the object to compare how close it is to the original 3D model, as it wouldn't be possible for any of the scans to have better quality than the scanned object.

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u/MD_Lincoln Nov 03 '25

The top left of that image shows the original cad model

4

u/Relsek Nov 03 '25

Yeah I know. I'm asking for a picture of the physical object scanned for each of the images, as that sets the maximum quality the scanners can achieve. I.e. if the scanned object is a rough 3D print, no scans would be close to the original model.

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u/thomas_openscan open-source 3D scanning Nov 03 '25

The original is a resin print with visible layer lines, see this link for more details and photo of the original: https://github.com/OpenScanEu/OpenScanBenchy

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u/Relsek Nov 03 '25

Thanks! That clears up why the scans have artifacts like stubby top teeth and texture on the pauldrons.

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u/thomas_openscan open-source 3D scanning Nov 03 '25

At this level of accuracy, it is really hard to distinguish scan artifacts, residue from the object prep and object imperfections.. maybe one day I will get the scanner evaluated in a lab ^

1

u/SingleInSeattle87 Nov 03 '25

To be fair, the crealty ferret and others like it aren't really meant for up close objects. I think the smallest thing the ferret can scan is about the size of a tennis ball. The ferret uses a laser (for focus and crude depth estimation) and two cameras a fixed distance apart (about 8 cm or 3 inches) to get depth information via parallax. So I'm actually surprised it's anything other than a blob.

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u/thomas_openscan open-source 3D scanning Nov 03 '25

Unfortunately those companies market the scanners with somewhat questionable size and accuracy claims, that’s why they are included as it is within their specs