I've made case for this item: https://www.bytedelight.com/?product=spectranet-internet-interface-without-case

Print it in PETG for best results

Cover present in two files that can be used for multimaterial print(even without MMU) or use just first file. 

I've print it with 0.3 layer. With good PETG you'll got good result.

How to print two colors without MMU(1 or 2) you can see in this video(I'm not author of video but using this technique):