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enter image description hereI would like to ask how can I measure a specific area which is located in a .stl file.

When I use the measure tool the statistics measure the whole .stl file and not the chosen area.

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The .stl file and with orange the area that I want to measure.

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    $\begingroup$ Please edit your question ... it is not clear if you want measure surface or volume (also your original version of Q wasn't clear that you are using addon Measureit ... people think you are speaking about Measure Toll stored in Tool Shelf of Viewport). $\endgroup$
    – vklidu
    Jul 3, 2023 at 6:17

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Calculate volume

... you need a manifold (closed) mesh. Like now it is open so Blender doesn't know what is a volume. You can ...

  • Shift+D (Duplicate) selected area and
  • P (Separate Selected), than
  • model in some way manifold object, than
  • use 3D-Print Toolbox addon to calculate a volume

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Note: if you need create a manifold you can ...

... use Geometry Nodes > Bounding Box node to calculate volume roughly

... or Remesh modifier (Smooth/Sharp) for more precise calculation

... or for the most precise calculation - manually select top vertices and Fill Grid

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  • $\begingroup$ I did but I only get mm2. when I try to calculate the volume from the measurement tools in the view sidebar $\endgroup$ Oct 12, 2023 at 19:17
  • $\begingroup$ Did you follow my instructions and created manifold object from the part of mesh you want to calculate volume? Or are you really speaking about 3D-Print Toolbox feature? $\endgroup$
    – vklidu
    Oct 13, 2023 at 7:12
  • $\begingroup$ Yes, I have pictures. I selected the square that I want to measure, I duplicated it, I create a manifold object of it. I changed the Units to millimetres, and then I went to Measureit tools I press the Area, and then the Show. But it only gets me mm2. $\endgroup$ Oct 13, 2023 at 17:18
  • $\begingroup$ I wrote you already (and my answer highlights that) I'm not using "Measure it" tool (because it measures only surface not volume ... that is why addon displays mm2) $\endgroup$
    – vklidu
    Oct 15, 2023 at 17:58
  • $\begingroup$ I also use the 3D-Print toolbox but it gives me the volume from the whole stl and not the selected. $\endgroup$ Oct 16, 2023 at 18:22
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Try enabling the measureit add-on. https://docs.blender.org/manual/en/latest/addons/3d_view/measureit.html

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  • $\begingroup$ Thank you for the answer. This is what I was doing until now, and it keeps measure mm2 and not mm3. $\endgroup$ Jul 2, 2023 at 15:35
  • $\begingroup$ I did all the suggested actions. But when I press the Area I get 00 mm2 $\endgroup$ Oct 12, 2023 at 19:03

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