I created an attachment for desktop posts from novus (and probably other brands) for cable management. I needed to mitigate the problem that the cable of my mouse was slipping down the desk every now and then, which lead to me needing to pull the cable up again while using the mouse.

I created an attachment that slides into the mount post. It can hold up to two cables at once (thinner USB cables may still slip but are less likely to).

To get a better Idea how to use this, please have a look at the photos.

Size of the knob that goes into the post:

Width: 18 mm
Depth: 7 mm
Freedom of front plate to knob: 6.4 mm

I redesigned this recently (FreeCAD = Old) to be a little smaller. It fits the same into the Novus Post but is a lot more compact and faster to print. There is a photo for a size comparison

Anycubic i3 Mega

Yes

.2mm

Yes, 25%

I set the support angle limit to 85° to get nice small supports that can be cut out easily.