A hex key holder for:
5/64
3/32
7/64
1/8
9/64
5/32
3/16
7/32
inch keys.

I've included the fusion 360 files so you can make changes to suit your needs.

Springs are two 1/4 x 1-1/8" extension springs linked together. I found the springs at Home Depot:

https://www.homedepot.ca/product/paulin-1-4-od-x-1-1-8-inch-extension-utility-spring/1000127101

Prusa

I3 MK3S

No

No

0.2

50%

Other materials should work too.