This model can be printed in 0.20 or 0.28, as showed.
I used supports for a better finish, vase and slider printed in 0.28mm layer, and balls in 0.08 layer.
you can use other balls with a diameter of 13mm
Before final assembly using CA or epoxy, use a metallic pin for the finger catapult, I used a clip.
https://youtube.com/shorts/_evxE7iZWP4
The author marked this model as their own original creation.