Measuring area of a .stl file

Question

I 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.

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). — vklidu, Jul 03 '23 at 06:17

vklidu · Accepted Answer · 2023-07-03T06:51:43.137

2

Calculate volume

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

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

edited Jul 03 '23 at 06:51

answered Jul 03 '23 at 06:44

vklidu

I did but I only get mm2. when I try to calculate the volume from the measurement tools in the view sidebar – Petros Mourouzis Oct 12 '23 at 19:17
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? – vklidu Oct 13 '23 at 07:12
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. – Petros Mourouzis Oct 13 '23 at 17:18
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) – vklidu Oct 15 '23 at 17:58
I also use the 3D-Print toolbox but it gives me the volume from the whole stl and not the selected. – Petros Mourouzis Oct 16 '23 at 18:22
Sorry, your comments are full of confusing informations for me. My answer is step by step solution... if it didn't solve your issue I don't know how to help. But since the answer you marked as accepted worked for you, I guess, so you probably skipped some step. If your first image (now) is your current state, you forget to separate selection by P shortcut into a solo object. If this is not the case ask a new question with structured steps you did.and where this A failed for you. – vklidu Oct 17 '23 at 06:08

score 1 · Answer 2 · answered Jul 01 '23 at 23:41

1

answered Jul 01 '23 at 23:41

Rick T

Thank you for the answer. This is what I was doing until now, and it keeps measure mm2 and not mm3. – Petros Mourouzis Jul 02 '23 at 15:35
I did all the suggested actions. But when I press the Area I get 00 mm2 – Petros Mourouzis Oct 12 '23 at 19:03