Where is the non-manifold body here?

tristan_schaaf

https://cad.onshape.com/documents/6cbeb503295e1bd0b143f7df/w/922cc2b087640a6d60676c92/e/14f3802aac4d40f09322c161?renderMode=0&uiState=66586bcfba1de45f3d6dd43c

I'm trying to model some stairs here, with 0 experience in CAD, so i'm basically just throwing stuff at the wall and see what sticks. I want to reuse this model several times in the project, and eventually print it. So I thought it would be wise to create a single part via a boolean.

Now; I don't know if that is even necessary, if the way I gotten to my part is the 'correct' way (if there even is such a thing). But besides that, which i would welcome the comments, I'd like to know why the boolean won't hold? Why doesn't it like this even though the stairs is constrained to bars...?

NeilCooke

An edge can only have exactly two faces - here you have 4.

Matt_Shields

Where the risers met the treads was non-manifold.

I dropped the tread down 1mm and the boolean worked.

NeilCooke

An edge can only have exactly two faces - here you have 4.

Matt_Shields

Where the risers met the treads was non-manifold.

I dropped the tread down 1mm and the boolean worked.

tristan_schaaf

I was hoping the extrudes towards the beams would've solved that. But i guess that doesn't count?

_anton

Better approach is to make separate parts and put them together in an assembly, or to group everything as a composite part.