This part is based on Jeroen van Zijp's "Bowden Locking Clamp Clip" (https://www.youmagine.com/designs/bowden-locking-clamp-clip).  I specifically selected the 1.5MM version and made two modifications:1.  I created a slight sweep up to make it easier to get under the connector.2.  I cut a slice out of the vertical cylinder to give it enough flex to get on but still hold tight.