Drink Coaster Holders

I have a thing for making drink coasters - so here are four coaster holders.

Coaster Holder 1.stl is grey in pictures
Coaster Holder 2.stl is green in pictures
Coaster Holder 3.stl is red and in pictures
Coaster Caddy Horizontal 14.stl is blue in pictures.

Each one holds 6 of my 100mm x 12mm coasters, except #4 - it holds 14 on end.