How To Make A 3d Shell Out Of A 3d-solid

**ajwira** · 27th Apr 2008 04:36 pm

I have done the attached 3D solid CAN with help of extrudes, regions, unions, subtracts, rotation and other various 2D & 3D commands. but i cannot make a shell out of it with a wall thickness 3mm. I do not get any error message as well. Please give me a guidance. Thanks.

**Cad64** · 27th Apr 2008 04:41 pm

Moved to 3D Modeling section.

**ajwira** · 27th Apr 2008 05:06 pm

I am in 3D Modeling. You mean to draw the whole object again? my problem the "shell" doesnt work for this solid object what I have done already. (Normally it had worked with other objects what I have tried with)

**ajwira** · 27th Apr 2008 05:19 pm

i tried to isolate certain parts thru slicing and certain parts I get the shell through but not with all the parts. Tried with several sections but unable to identyfy a possible reason why the shell doesnt work for the whole object.

**Cad64** · 27th Apr 2008 05:48 pm

What I meant was, I moved your question to the 3D section so the right people will see it. I don't use Autocad for 3D, but when I tried to shell your object, I got this message: "Non-planar faces cannot be extruded and are ignored for this operation."

**ajwira** · 27th Apr 2008 06:26 pm

thanks i will look into it.

**paulhea** · 27th Apr 2008 08:55 pm

pretty sure this is down to solid complexity.

**yedan** · 27th Apr 2008 10:20 pm

i would agree with Paulhea its most likely down to the complexity of the object the shell command is very tempremental and if you try shell some thing that produces self intersections it will fail. i think it is prob this that is stopping it, something is self intersecting after the shell and the program cannot fill in the missing data itself. i suggest you slice and dice the model shell what you can the re-draw the parts that will not withour all the blend radii and fillets, the try again. you could try scaling a copt of the model slightly smaller and subtracting but this will only work so far.