This is a 1U cable management piece I made to hold cables in my 19" rack.
The zigzag gap allows you to insert cables without them coming out. I have been able to fit Cat5/6 cable and even a large VGA cable without issue..
There is a large amount of vertical play in the screw holes to allow flexibility in mounting.
I created this because I wanted rackmount cable management that I could print without supports.
Interior dimension of the cable area is 26x26mm.
Recommend printing with a brim since there is very little bed contact area.