18mm Split Grommet

I created a couple grommets a while ago for lightboxes and other things I print. I seem to find myself putting a slice into the grommets 8 / 10 times I use them so created a version with a slice which makes it easy to compress, put in a 18mm hole (or 18.2mm hole) and it expands back out. I print them in TPU. Allows for commercial use so you can use them in your lightboxes that you sell or whatever you'd like.