Is it possible to extrude a large closed profile while still keeping all the profiles/lines inside?

[maula006]

I have the complex sketch below which I want to extrude all upwards so the entire sketch has a certain thickness.

But - as expected - a new body is extruded with none of the lines and closed profiles from the sketch preserved on any of the shape's faces.

What's the most efficient way of extruding the shape while preserving the lines and profiles on the new body's top face? 

I'd like to shy away from simply copying sketches if possible because from my experience, there are always things out of whack in the pasted sketches, such as the need of constraining parts over again and also things simply being out of place (like the below picture). But If there isn't an option anymore efficient than this though... Oh well, it was worth a shot.

[g-andresen]

Hi,

as i understand it, no additional sketches are required if you use some of the extrude options.

Screencast

günther

[davebYYPCU]

Extrude downwards, will keep sketch on top for new purposes.

Copy paste a fully defined sketch - should not misbehave, we will need a video to see how you are breaking the system.

What's the most efficient way of extruding the shape while preserving the lines and profiles on the new body's top face?

You can't do that, but you can Split Face after the extrude.

Might help...

[TheCADWhisperer]

What exactly are you attempting to model?

[maula006]

I wanna try to create supports/"boots" for my inline skates so I can walk indoors without needing to swap to my shoes.
The initial extrusion is base of the boot, and what comes after is the main structure that holds the wheels in place.

[maula006]

Yeah, it's just that having the sketch on top simplifies the formulas of all the extrusions a bit... but yeah I can do that too.

EDIT: Actually... I want to use the sketch of some of the shapes to loft through so it has to exist on the surface itself.

Kinda like the follwing, which I achieved by turning the sketch into a 3D sketch, making it coincident with a vertical line, dimensioning that line to the thickness of the base, and extruding downwards (But... I can't use this solution because I need the sketch mirrored for future later parts of the model, and I don't think you can mirror 3D sketches)

[g-andresen · Accepted solution]

Hi,

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@maula006  schrieb:

EDIT: Actually... I want to use the sketch of some of the shapes to loft through so it has to exist on the surface itself.

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PROJECT 

günther

[maula006]

... perfect.
A bit slow since I can't create a selection box but it definitely works in my use case.
Thank you!