Just a small spacer to get the level of the rack a little bit higher.

In the photo, I printed it in PLA with high velocity on an Ender 3 V2 and a 0.28 layer height. Doesn`t look that good but still works.

Feel free to make some comments regarding the tolerances, to make it snap a littel bit smoother. I just didn`t want to print it again. :-)