This seems like a bug, but I’m brand new to 3D printing so maybe I’m missing something here. I designed a spice rack in onshape. It’s too big to fit in the printer, so I cut it up into 3 parts in bambu studio (with connectors). The resulting objects get “non-manifold” errors. When I slice it, one of the 3 parts (top pic below) has the spice jar holes filled with in-fill. There are no errors or problems slicing when I scale the whole thing down to fit on one plate.
1 Like
Looks like a bug… I’d move the cut line a bit to see whether that fixes it.
BTW, For the connectors I recommend you try the “frustrum square” dimensioned so the edges are at 45 degrees. Then you don’t need support…
Funny, you should post this, I just ran into this last night and the results were bizarre, but it’s easy to fix. It’s not a bug as much as an incompatibility within Bambu Studio itself when the Bambu slicer splits an object. So maybe that justifies calling it a bug. 
The quick fix:
Right-click on the object and click repair. That will find holes in the mesh that were created after the cut and sews them up.
The better fix:
Use the split tool in Onshape and export the model as a STEP file. Just note that the dimensions need to be no larger than 256mm. In that way, the Bambu Slicer graphical tool is actually easier to use but produces less precise results.
Then if or when during import, Bambu asks you if you want to combine adjoining parts, click no. Or if you forget to do that, you can later click the split to objects button in the tool bar then click arrange to let the slicer move the parts into optimal plate position.
1 Like
Try using the “fix model” option by rightclicking the cut parts and chosing fix model😇
This repairs non uniform meshes and some other defects.
Happy printing😎