Needed an "extended" slightly longer version of the closet rod holder for my closet so I quickly whipped this up in openscad and printed it out. Works like a charm!

I added a Heavy Duty (denoted by "HD" in the name) version as well.

There are two pieces one for the end and one where the rod drops in from the top. Print one of each and affix the standard closet dowel.

Note in my closet these don't bear most of the weight but it does hold the rod so it doesn't rock back and forth on the center point.

On my ToM w/ MK7 - 1 extra shell 35% infill. I might make a "heavy duty" version.