I made this case since I did not find one that I liked. I made this to store the Flipper Zero and USB cable in a strong but compact case. Other's that I've seen was bigger than it needed to be. Mostly because they are using the rubber inserts that came with the Flipper Zero. This design is for anyone who wants a smaller footprint or threw away the rubber inserts long ago.

• I designed a custom insert so that the Flipper Zero fits snug but not tight that it's hard to remove. 
• I designed a custom insert for storing the USB cable and have it hidden so it doesn't scratch the screen of the Flipper Zero.
• The design uses M3x20 screws 
• I added the Flipper logo to the top lid

Recommended print settings

Layer height: 0.2

Wall loops: 3

Infill: 20% gyroid

Support: none

Elephant foot compensation: 0.3

Note for inserts:

I recommend shrinking the lid insert from 100% scale to 99.75% scale. For me, this is a perfect fit. It's not too tight and not loose that it just slides out on its own. Adjust the scale by 0.25% at a time until you find the right fit that you like. I don't recommend shrinking the bottom case insert because it might become too tight for the Flipper Zero to slide in and out. If the bottom insert is too tight, I recommend sanding the outsides until it fits properly.