t-echo expedition additions

some of my additions made to the excellent cases for the t-echo meshtastic device

1. a usb cover, to be printed in tpu or other flex material. the model is scaled to be 5% oversized which works, but slightly less may be easier to insert.

2. a (customizable?) name plate. I used this to print my node short names for easier identification in the real world. print with a filament change so that text+rim contrast with the background.

3. low effort 'gaskets', simply sliced parts of the rear + upper part of mid section to be printed in tpu.

Note: I also printed the 'corona' piece in tpu and inserted it on the _inside_. it squishes fairly firmly up against the e-ink screen which I think will make it sort-of weather proof. the trim around the screen in the picture is the same piece printed in pla, but with the 'flange' snipped off, sanded down and glued in...