hi,i'm a newbie in autocad3D,a real beginner(better with 2D), plz help me for converting this object i've made into a solid, it's my homework which have to be ready upto tomorrow!when i use CONVTOSOLID the error is "cannot convert a open curve!"plz answer me as simple as possible  or if it's possible i wil appreciate if u can upload the ans for me. 3d file= uploads/475876/3d.dwgisometric original view=uploads/475876/page31-shekl3.pdf

plus, i know my method of making this object upto here wasn't standard,((making whole shape box then using press pull and "taped faces" for atilt surfaces)) but  i want to some how make a conclusion from "this" drawing and I just want to "edit" this,not a new one!

You would like it if someone here figured this out for you and uploaded a drawing that you could had in for extra credit?  You get the grade and we get.............what?  A prize?Do you have a dimensioned drawing to share with us?

It looks like someone over at CADTutor solved the problem at least to their own satisfaction.  My guess is that you could create surfaces of the different faces then use either the CONVTOSOLID or SURFSCULPT command to end up with a 3D solid.  I doubt that there is an easy way to fix what you have in your drawing.  Looks like you have some sort of opening in part of your model that just doesn't belong there.  Otherwise, the rest of it looks pretty good.Another idea.  Create surfaces then use the THICKEN command.  That will convert the surfaces individual to individual solids.  Once you have that then UNION the whole mess together and there you go.  Result=3D solid.

tnx,besides I just meant to correct the last step of drawing which i drew it in more than 5hours!!! I don't think it takes more than a minute for professionals here!

You have four different faces to contend with three of which are vertical and two of those slope at different angles.But it ain't our assignment dude!  It's yours.  Pay me and I will deliver you a 3D solid model.  My starting rate is $150 per hour with a 4 hour minimum.  I'll provide you with my PayPal account name and when I see the money has been deposited I will email you an AutoCAD drawing containing a single 3D solid model.  So you will also have to provide me with your email address.  I await your reply.  Hurry as I have another job to work on that is due tomorrow.
John Connor2014-05-30 20:10:20

sorry I did'nt know these rules over here,I prefer to deliver my own faulty file!

There are no "rules over here"; it is my own rule that basically says I don't do homework for free.I gave you a couple of methods to try.  Instead of getting all mad about it get to work!  When you are out in the real world getting paid to do CAD drafting/design you either do the job you were hired for or you get fired.  Slackers don't get a break.Go back to CADTutor.  Looks like the guy that was trying to help you posted a reply outlining the steps you should take.  That's pretty nice of him don't you think?
John Connor2014-05-30 21:20:09