ClosetMaid post foot
thingiverse
This is remixed from RandallOfLegend's ClosetMaid Rail Post Coupler, which after making I realized could make a decent foot for the same post, sliced in half. This is actually better than the soft rubber one they give you, which is much better saved to use as a post cap.
Download Model from thingiverse
With this file you will be able to print ClosetMaid post foot with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on ClosetMaid post foot.