It’s not that bad, glue and screw. Remove the inner board from the drawer front and reattach it to the drawer first. You might have to clean up the MDF a bit. Use filler if you have to, maybe, but don’t use nails. Then reattach the drawer front - again with screws. It might not look perfect, but it’ll probably look fine when the drawer is closed. Consider wood block fillets at the interior corners (sacrificing a bit of space).

Alternatively you could rebuild the drawer frame, using the same drawer front so it matches.

Our house has wall vents for all 4 bathrooms, so it’s definitely something allowed by code here. It works just fine, there are louvered exits on each one. It’s better than venting into the attic like a lot of older houses for sure.

I think Bambu is taking a reasonable approach - allowing people to do what they want, with the understanding that you can’t have it both ways, so you are either in the closed ecosystem with support and warranty, or not.

You can try adding a brim (or a raft if that doesn’t help) and see how that goes - tall and skinny models can require some extra bed adhesion to be stable, and that can affect the very top if the model is moving enough for the extruder to hit it. Worth a try…