Airsoft Ammo-Catcher Target to fit inside a hole in an Utz Cheese Balls Container (28oz) - Use 3mm diameter rod or nail as hinge-pin. Use back of curved piece to mark hole. I'll probably make an easier template for the hole cut-out that you can print on paper or quick print in 3D.
Hot glue foam rubber or thick felt to back of inside container.
Will share on thingiverse with link once I finish printing and assembly (and make sure everything works). I'll update this model as well and leave notes.
[EDIT]: I may have to file a bit off the top corners of the outer #1 ring at a 45° angle. On closer inspection I can see where there may be a bit of rubbing/catching. Easy fix on final model!