Problems

[robaktime]

I have used similar pins with limited success. The linear stress tends to work them loose even if they don't break. I changed to a post and tube. I have had success even without gluing. I made several with the approximate dimensions you are using and they have potential. They cannot be removed without breaking the cap but they are easy to make in abundance and easy to replace.
If the hole could be slightly larger allowing the pins to be slightly larger it would be a great advantage. It looks like you have some room.
Most the files on Shellmo would be a great challenge on FDM printers but I will certainly try it later this year because it is a very,very nice piece of work.