3D printing and internal support structures

Hi, I’m looking for a little bit of advice. I’ve had good success up until now with various 3d printed parts (mostly 316) but the most recent part is throwing me a problem. The vendor has come back to me to say that the geometry will prevent the internal support structures they need from being removed once the print is done.

I can see the issue and to be honest I hadn’t really given it much thought during the design phase. I’m wondering what people generally do in this situation. I don’t particularly want to compromise the design but now I know that the issue is there, it seems like I could integrate the supports into the design.

The part is under NDA so I can’t really share it but it’s largely tubular in structure. My first thought is that if I need to accept internal, non-removable support pieces then I could perhaps dial down the wall thickness of the part and design in some infill. Is that something that’s being done? I’m used to designing for casting or machining so specifying an infill in an otherwise hollow part is new to me. Are there resources or tools that someone could perhaps point me too?

I’m interested in what others do in this situation.

I have that issue with my yokes. I just leave them in and not consider them in the structural integrity. It is only a small area that it is an issue so weight wise only a few grams.

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