Dear guys, please help me. Is there anyone know how to convert my draw into 3D solid? For your information, there's 32 surfaces can't be converted into 3D solid. And I don't think thicken is the way to solve this problem. Thanks before.

 
Hello otusbakkamoena, your 3D doesn't look so complicated for it not to be only a or various regions to be relvoved i.e. :
You create in the Z direction a profile that you will REVOLVE around the vertical centerline.
Eventually see my file : 3D SOLIDS 01.dwg here in the CAD / BIM Blocks.
Please tell us if this helped or not.

1. Create a closed polyline profile.2. Reorient it and draw a single line (red) where shown below.3. Use the REVOLVE command and its OBJECT feature.4. Revolve around the red line 360 degrees.5. Done.Remember: If you revolve lines you'll end up with surfaces.
John Connor2014-12-09 13:20:20

But still, I can't convert it into solid. I don't want to use 'thicken' because the command made the different result.Here's my last sketch..Btw, thanks for solved my first problem.

Neither one of the suggestions offered said anything about using the THICKEN command.  YOU were the one that mentioned it so I'd say do NOT follow your own advice.So if you solved your first problem what's the second problem?

My next problem is I can't convert it into solid. There's 44 objects can't be converted. Because i want export the drawing into .stl fileSo, how to fix the problem? Thanks before

You wouldn't have to convert it to a solid had you followed my directions.  See my first reply and do what I said.BTW...I opened my version of the drawing which DOES contain a solid and I was able to export it as a .STL file to my Desktop.
John Connor2014-12-09 19:47:58

i already follow your instruction, can I send u an email? So, maybe you would know what exactly my drawing problem is. Thanks.

No you can't send me an email.  If you followed my directions and used a closed polyline as the profile for the object then the end result would have been a solid.  I know because I did it myself.  I would not suggest a solution unless I knew it would work.  I usually test these things before posting.What command did you use to try and convert the surfaces to a solid?  And don't tell me you used THICKEN.
John Connor2014-12-09 20:01:24

Do i create a closed poly?

AutoCAD 2013?  Do you have the SURFSCULPT command?  If so you can use that to convert your object surfaces to a solid.  I know because I just did it.  I exploded my polyline profile to just lines and arcs and revolved it.  I ended up with surfaces.  Then I used the SURFSCULPT command to convert to a solid.  The white object shown below is comprised of multiple surfaces while the magenta object is a solid.
John Connor2014-12-09 20:10:55

so, how?

And, finally.. YES.. BIG YES.. Thanks Sir.. I'm happy with your instruction.. Greetings from Indonesia..

[QUOTE=otusbakkamoena]
Do i create a closed poly?[/QUOTE]Really?  You don't know how to create a single closed polyline profile from a series of lines and arcs?  Why are you even attempting to work in 3D if you are not familiar with basic 2D polylines and what can be done with them?Look at my profiles in my first post and compare them to what you have.  Do you see any differences?You can use the PEDIT command, which stands for Polyline Edit, to "join" multiple lines and arcs into a single closed polyline.  Have you heard of the command?

My disk profile looks like this in 2D.  Look closely at the parts circled in yellow.  What's missing?
John Connor2014-12-09 20:18:51

[QUOTE=otusbakkamoena]And, finally.. YES.. BIG YES.. Thanks Sir.. I'm happy with your instruction.. Greetings from Indonesia..[/QUOTE]Well I hope you get what you are looking for.  In the meantime I have to go bail out my house.  It's been raining like crazy today.  I'll check back in a couple of hours.  Good luck.

look, it works and done. Now I know how to convert the surface (revolve) into 3D solids. Great

You definitely lucked out.  Sometimes AutoCAD reports a failure.  Good job!