One of the top level trays came with the portion that clips over the cage bars for support was snapped off and compromised even being able to use it.  I made things work by drilling a couple small holes and running wire through it to tie around the cage bar.   The cage comes in an upper and lower section, found they did not line up well when trying to stack them to join.  This caused a twist in things so then all the tray levels didn't want to sit right and lifted.   Managed to manipulate things to get it more acceptable.  I ended up putting small beads of hot glue at each point where the trays clipped on to keep from shifting around and give things more stability.  It definitely takes some time to put together.  Its a cute cage over all, but it is pretty cheap quality.  Definitely glad I got it at sale price.