Separate a part without holes It's my first question on Stackexchange :)
I've been using Blender for a long time now, but I'm still a big noob about it. I use it to create or modify future 3D prints for my personal use.
I'm facing a problem : I would like to separate a part from a model. I did this a lot of times : I select all the vertices and I click on &quot;separate&quot;. But as you well know, when you disconnect a part from a model, you only get the outside of this part, because the faces sticking directly to the model simply didn't even exist.
Is there a way to disconnect a part from a model, but without those holes ? You know, a &quot;closed&quot; disconnected part, with the shape of where it was attached...
I did a simple example in those pictures, 

See ? I know it makes sense in Blender because all models are &quot;empty&quot;, but is there any way to keep those parts &quot;full&quot; ? Thanks !
Simply use an object with almost-zero thickness for a Boolean difference.
That will get you a clear cut, with 'filled' holes.
Using a 0,01mm thick plane for a Boolean difference