From: krass 4 Jul 2013  (1 of 11)
 Dear friends, please help! After Boolean operations inside the figure were unnecessary (?) Line. I can not figure out how to remove them from there. I think they're unnecessary and polluting the geometry. But how? I'm confused and ask for advice. Enclosed is a model and a picture of the problem. Attachments:

 From: krass 4 Jul 2013  (2 of 11)
 6006.2 In reply to 6006.1 Michael! And another question for you, even if it will seem ridiculous. Solid and Joined Srf. - What are their essential difference? And how to convert Joined Srf. to Solid again? Because after my model - for some reason was of solid Joined Srf. And now some Boolean operations do not want to run as before. Help me, please!

 From: Frenchy Pilou (PILOU) 4 Jul 2013  (3 of 11)
 For the no wished lines Select All / Separate Hide some surfaces Erase Lines

 From: OSTexo 4 Jul 2013  (4 of 11)
 Hello, The geometry you highlighted is not an edge, if you zoom in you'll see that is actually a very thin surface running horizontally and two holes very thin holes running vertically in your model. If that is not intentional you might want to align and rebuild that area of the model.

 From: Andrei Samardac 4 Jul 2013  (5 of 11)
 6006.5 In reply to 6006.4 Krass, Solid is closed joined surface. Joined surface is when surfaces are joined but not close. To solids you can apply booleans to joined surface only partially.

 From: krass 4 Jul 2013  (6 of 11)
 6006.6 In reply to 6006.5 What is "closed"? ((

 From: Michael Gibson 4 Jul 2013  (7 of 11)
 6006.7 In reply to 6006.6 Hi krass, a "closed" solid means an object that is made up of set of surfaces joined to one another so that every edge of every surface is joined to another surface. An object created like that then forms a closed watertight skin that defines a volume. If you have some surface edges that only belong to one surface (these are called "naked" edges) then that means your object does not form a closed volume and it's an open surface instead. - Michael

 From: Michael Gibson 4 Jul 2013  (8 of 11)
 6006.8 In reply to 6006.2 Hi krass, just to address your original question more directly: > Solid and Joined Srf. - What are their essential difference? A solid means it's a "watertight" volume, where all edges are joined between 2 surfaces, so your model has a continuous skin that divides space into separate inside and outside areas. A "Joined srf" means that you have some naked edges in the model, those are edges that are open and only belong to one surface instead of being joined between 2 surfaces. For example if you draw a box and delete the top face, there will be an open area on the top and it will not be a solid anymore. > And how to convert Joined Srf. to Solid again? You need to find where the naked edges are and construct surfaces and join them in to fill those areas in. There is a script you can set up that can help you to locate naked edges: http://moi3d.com/forum/index.php?webtag=MOI&msg=3804.2 - Michael