This is a shallow seed tray/dish with brackets to attach to the cage bars using M3 bolts and printed brackets. I have used this on horizontal bars but it should work as well on vertical bars. My budgie loves it.
Technical
It is best to use PLA because it is made from corn starch. Do not use ABS. Be sure to remove any fine strings of plastic or loose filament. Use only with dry food.
This is printed without supports.