Quick plug design to fill those annoying dust collectors on the mountings. This is just a simple angled dowel that will fit in the angled holes and over the internal screw/bolts. One size fits all of the 24 gaps, although if your like me only needed 20 as back half of x rail filled by wire management tracks already. Note I printed mine no supports, thick layers, with the angled face down, as that gives a nice appearence on the only surface that can be seen when installed. Print a few extra, as I just used a sharp pick to remove as necessary, just poking through the face if I need to remove them.

Added an extra version with small slot for screwdriver removal, and also modified original to be in face down print orientation.