I think you could certainly 3D print some options, maybe even with some soft TPU, but designing the files would probably be pretty tough. 

Maybe some thin adhesive backed foam sheets, cut to shape and applied as a pad on some of the edges? The other option is to sand/file down the edges. Easy on the aluminum, as long as it doesn’t effect function. 

Ryan/// ~sigh~ I blew up another bowl. Moke told me "I made the inside bigger than the outside".