2x4 Post Cap
thingiverse
I couldn't find a Post Cap for a 2x4 anywhere at the local big box stores, so I just whipped one up and printed it. I personally used these at the end of a 2x4 that is 10 feet long standing vertical to protect the end. I use a pair of these at the end of my 6 foot tall privacy fence to hold my ham radio antenna.
Download Model from thingiverse
With this file you will be able to print 2x4 Post Cap 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 2x4 Post Cap.