This Customizable Guitar Pick is easy and fast to print and will be helpful for playing guitar. It is sturdy and will last a while. If it's broken just print another one in about 5 minutes.

I highly suggest printing those picks with PLA and not with ABS because ABS is too flexible and breaks very fast.
PLA on the other hand is very sturdy and lasts a long time.
You don't have to change anything on the size of the pick because it is already the perfect size.
If you want a :
Hard Pick you just leave it like it is.
Medium Pick you have to lower the value of the Z-Axis a bit
Thin Pick you have to to lower it even more
Do want you feel most comfortable with.
Layer Height: 1.5
Infill Density: 1
No support!
Good Luck!