This is a cover for a broken handle on the Pottery Barn Rolling Backpacks.
The handle on my daughters backpack broke and no longer worked as a rolling backpack. This left very sharp aluminum tube exposed where the extension tube snapped off at the top of the backpack. I designed this cover in OnShape to fit directly over the domed plast piece on top of the bag.
Print this using the strong settings or at least do 4 wall loops.