These are USB dongle holders for the oval style USB that comes with most 3D printers. They simply replace the endcap on your 2040 aluminum rail. I've included 2 files. One has no tabs around the edges to fill in the rail channel and the other has the tabs to fill in the rail. My 2040 rail is smooth on one side where other people have the rails all the way around so I designed both to fit your needs.
| 2040_USB_Holder_No_Tabs.stl | 97.8KB | |
| 2040_USB_Holder_With_Tabs.stl | 139.9KB |
