1 in Bumper hitch plug

thingiverse

1 inch plug. Can be used on just about any thing you need to cork shut. Print in TPU for flexibility. Supports are unneeded but can be used for fillet on the head Infill will determine flexibility. I used 75% and it was hard to install, but thats the point. It needs to stay in place and not wiggle out over time. My first print was at 25% and it was very flexible.