When I was a kid I used to have a sligshot pretty much like this.
Unfortunately my beloved slingshot was stolen.
After many years, I designed my slingshot in CAD and printed it.
The design is according to my memories....

This model has been designed on onshape.com.
Source is here availlable:https://cad.onshape.com/documents/65f7d6983ba415fc88f0e0f1/w/97cf2710e12296a5c3abe3bf/e/78d75b40719d8136515bb968?configuration=Height%3D0.12%2Bmeter%3BLowerWidth%3D0.015%2Bmeter%3BTickness%3D0.014%2Bmeter%3BUpperWidth%3D0.035%2Bmeter

Creality

Ender 5

No

No

200

50