Customizable Barrel Nut

This is a customizable barrel nut commonly used in furniture kits. I lost a couple when moving things around and designed this to replace the missing plastic barrel nuts.

I am aware of one other one: https://www.thingiverse.com/thing:2751283 but it wasn't the size I needed and isn't customizable, but has threads. Check it out in case it happens to be the size you need.