Did you (or your child) promptly lose the two discs that came with the Spidey and his Amazing Friends disc dasher toy? This is a straight replacement and makes the toy work as intended again.

The parts might require wet sanding to be able to store and shoot two discs. In the raw printed state there is too much friction and they stick together and get stuck inside the toy. Using a single disc at the time is fine straight out of the printer.

I've also published this file on: https://www.printables.com/model/655128-spidisc-disc-dasher