What I Changed:
Added an extra hole to body and length to pin to allow you to lock it in so it doesn't fall out.
Adjusted sizing to fit nicely with increased tolerances of P1S
Plated parts
Painted the cage in 2 colors
Brims where needed
Setup variable layer height on cage
I included the bits to make it spring-loaded, but I don't have any springs atm so mine is not spring-loaded.