These are some decorative signs for recycle bins. I'm Dutch myself, but I've added a few more in English. Each sign has two holes which fit to the nipple I've added. My bins were difficult to glue (polypropylene) so I made a few holes and used theses nipples on the other side to mount/glue them on those.
If you print them with one of the faces down on the plate, they don't need any support to print.
Print them with one of the faces down to the plate.