3D printed blank inserts for removed switches on an MX plate.

Hi,

Sometime ago on reddit ergomech I saw a post about blank inserts to fill in the gap after a key switch had been removed. I have access to a 3D printer now and cannot find anything anywhere about this post. I was wondering if someone knew where I could find the file I need. It was a gird of inserts. I pulled a few keys from my ergodox and they keep filing with dust, not the end of the world but now I can do something about it, other than sticky tape and cardboard :)

Thanks