I suppose there's a few of these out there but I thought I'd do my own. I wanted to add a 5V USB power socket on my Ender 3 Pro so I designed an holder for a USB socket to PCB adapter from Banggood, also wanted to test out the accuracy of the Ender 3 so I printed the USB holder and nut with an M20 x 1.0mm thread and it actually worked. Screwing the nut on was a bit tight to begin with so Printed a small socket to aid tightening the nut. I've also included the Fusion360 file.