[Newbie] Help assembling the model

[lifesmellow]

Hi all,

I am a total noob but eager to learn. I am building an enclosure for my printed circuit board. I was following a series of tutorials from Autodesk fusion 360 to create the box and the lid around my pcb (designed in Autodesk Eagle). However the tutorial creator never finished the last part of the tutorial, in lieu of which I had to make some 'educated' guesses. The 3D printing service I submitted the files to has commented that the model cannot be assembled as-is - the reason is likely related to the pipe/lip feature around the lid (as pointed in the noted image). Can someone peak at my files to guide me why this model cannot be assembled? I am at lost for next steps. Thanks so much.