I work in a bakery and the USB-C charge port on my phone tends to get packed full of flour and becomes unusable over time. To prevent this, I designed this dust cap to cover the port when not in use. There are a couple other models on Thingiverse, but I had no success with them.
If necessary, scale it in your slicing software to be 10mm (1cm) on the long axis. It's a tight fit but that's so it doesn't fall out. It's very small, only between 3 - 7 minute print on my Ender3 even at fine resolution.