Add infill to closed, shelled body

[davethomaspilot9V8SL]

Say you have a 100% closed body, like a box.  It doesn't need to be solid, so I perform a shell on it.

But, now I can't 3d print--I need infill.  I'm thinking I should add it to the design rather than do it in a slicer?  But, how to design "inside the box"?

Do I need to split the body to create a sketch on an inside face of the box, design the infill, then combine the bodies (or leave them separate and export both as a mesh to a slicer)?

[wersy]

Don't shell a body for printing. You can't infill in hollow space,
Control the shell by perimeters.

You can upload you file and tell us what you exactly want.

[davethomaspilot9V8SL]

I think the question is pretty clear.

Solid box.  How to make it hollow except for adding infill.

Do I need to create a design of a cube  and upload it to illustrate?

[TrippyLighting · Accepted solution]

Controlling infill us usually best done in the slicer.

If your design has very special requirements, you should shell the object and then manually add infill.

If you have further questions on a specific design, then please share the model.

Adding a section view can make it easier to model on the interior of an otherwise fully enclosed object.

[davethomaspilot9V8SL]

The cube is shelled.  ( as indicated in the title of the post. ) But I cannot select inside the cube to design the infill.

I think i can split the body, hide one of the resulting bodies, design the infill, then combine the bodies.  

Is there a better way?

[davethomaspilot9V8SL]

The cube is shelled.  ( as indicated in the title of the post. ) But I cannot select inside the cube to design the infill.

I think i can split the body, hide one of the resulting bodies, design the infill, then combine the bodies.  

Is there a better way?

[davethomaspilot9V8SL]

Section view!  Got it.

[laughingcreek]

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@davethomaspilot9V8SL wrote:

The cube is shelled.  ...

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why? it will be easier (as in an automated process instead of a manual one) to add infill if you don't shell it first. 

[davethomaspilot9V8SL]

I have no clue how to do it without shelling it first.

I have a solid object. Cube is an easy example, but the real example has a complex outer surface. I want a shelled object, but infilled so it can be 3d printed.

I'm happy to design the infill.

What's an automated process to do it?

[davethomaspilot9V8SL]

A little more detail...

The "infill" needs to be designed to facilitate convection cooling.  So, I'm worried an arbitrary infill from a slicer like Cura won't fill with a good structure that allows airflow.

Thanks for the replies!

[laughingcreek]

and down the rabbit hole we go.

maybe post a sketch of what you are trying to do.

could be we are stuck on semantics. you keep saying "infill", but sounds like you want to use the infill as "supports". to different functions really.

and now it needs to be functional for convection cooling (on a closed object?)

if you have a paid subscription you might explore "volumetric lattice" . I use the gyroid shape frequently for resin printing. drains well, doesn't need addition support to print, and the strongest infill shape I have found. volumetric lattice allows for a custom shape that might suit your purposes.

[davethomaspilot9V8SL]

I knew I should have stuck with just a cube for the purpose of getting the answer I needed...  

The closed shape is actually "perforated" with holes to allow air ingress.  But, all I was really missing was how to design "inside the box".

I do have a paid subscription, but the task is already completed.

[etfrench · Accepted solution]

Create a body larger than the current body.  Combine/Cut the current body from the new body keeping the tools and creating a new component.  Remove or hide the outer body in the new component (as well as hiding the original bodies).  This will leave you with a precise inner body of the shelled original.  Design your 'infill' in this body.

[wersy]

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@davethomaspilot9V8SL  schrieb:

I think the question is pretty clear.

Solid box.  How to make it hollow except for adding infill.

Do I need to create a design of a cube  and upload it to illustrate?

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This is a closed box

This is how you can slice it with your slicer for printing.

[darkraids411]

I have a can koozie model i have struggling to add infill to the hallow section beween the 2 sidewalls any insight there?

[wersy]

Please upload the file so that we can take a look at it.