light track flexible end cap for transport

We use standard office or household track lights for lighting our booth at craft shows. One of the annoyances of using it is that when storing it or transporting it, the electrical rails inside are free to slide out. I already published another model to make replacement permanent end caps that are necessary at the end of each run of track in use. However, if you are transporting the track, one end (or sometimes both) will be open, so I created this sock to retain the rails.

This is designed to be printed in Flexible filament. It is intended to be quite sturdy and to survive a lot of use. It fits on the standard light track available at Home Depot and many other places in North America. I don't know if similar track is used elsewhere. This track measures 17.7mm x 35.4mm (approx 11/16" x 1-3/8").