I was inspired by Mr.Baham to make a USB mount that didn't require any hardware. This mount will snap fit into the 3030 extrusion. It works best if you stick one side in and lever it into place (it's a tight fit).
You will need a USB male to female extension cable with a Left angle. I bought this one from amazon and used the other one on my PC. https://www.amazon.com/gp/product/B0793P8XJK/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
I included the .3mf file for the mini which should have variable layer height at the top to smooth out the fillet.
The author hasn't provided the model origin yet.