This is a four piece dryer for shoes that fits on most all floor vents found in homes and offices.
To make this dryer, print two of the connectors and one of the shoe dryers. For the last piece, mirror the shoe dryer across the side with the holes in it, and print. Once done, set the dryers side by side and press in the two clips.
Hope this helps some folks out, out there. It works for my dad, and he's been using them since last Christmas, walking an average of 10 miles a day at work.
Might want to use a small brim to avoid corner peeling over the course of the long print.