Printing non-manifold surfaces correct way

[yesbird]

Hi, guys !

I am trying to print a mold with single vertical cut of one polygon  width, but manifold processing don't allow me to do it correctly. Different setting leads to non-desired results: some polys are disappear when "Discard" option is set or new unwanted polys appear when "Heal" is selected.

Could you please help me to prepare this print correct way ?

BTW: Can not figure out why this surface is detected as "non-manifold" ? All normals are pointing to the same direction if we will "unfold" the model.

Thanks in advance.

[dkightley]

You can only 3d print something that is manifold. Simply put, Manifold objects are objects that can exist in real life.

What you are trying to print is a non-manifold..its not something that can exist in real life as an object. Make it manifold is my advice.

[yesbird]

Thank you for reply, but I still don't understand why this object can't exist. Take plastic bottle, cut off top and bottom, make vertical cut and you will get desired object.

But it seams to me I found solution: giving the thikness to the walls.