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First of all, thank you very much for both answers!

So I took the advice and did the following steps:

- Used the "Cross section" tool to get rid of the top part of my model;
- Used the "Segment" tool to separate both inner and outer surfaces from each other (in order to apply the RANSAC plugin ...

Hello forum!

Can anyone give me some tips on how to measure the internal and external diameters of this 3D object that I've created?

I thought about cropping the external and internal surfaces, but I couldn't figure out how to do so, since there's no "circular" option on the cropping tool.

I also ...