I was having issues with the pins for my Pastamatic with 3rd Wheel Rollers slipping loose while I was respooling, so I decided to (crudely) redesign the pins to be snap fit. I am happy to say that they work great for me and I have not had a single pin accidentally slip out since I installed them.

The attached print profile is for 3 pins.  I printed in PETG, although I expect PLA will work fine.

I made snap fit pins for the rest of the Pastamatic as well - https://makerworld.com/en/models/200882.