I found the mint tin limiting though if you’re adding wires & parts to your circuit, plus I have always felt a little iffy about putting prototypes in metal enclosures.
So here’s a printable case for mint tin-sized circuits like the Menta. It has openings for the DC power jack and the FTDI cable.
Included is a 25mm high version and a 35mm high version. For larger or smaller sizes, it’s pretty easy to stretch the case bottom to fit your size. Also you can design in some holes for pots & switches on the top.
The case top has little clasps that grab onto the small nubs on the case bottom to securely keep the case on.
Adafruit MENTA – Mint Tin Arduino Compatible Kit, Includes Mint Tin. Introducing the MENTA, a portable minty Arduino-compatible project that fits into a common mint tin. We took our super popular Boarduino series, and wrapped it with a prototyping area into a rounded PCB that slots directly into an Altoids-sized metal tin. We included everything you expect to jump-start your project:
DC power adapter jack with polarity protection
Beefy 1 Amp 5V regulator and 250mA 3.3V regulator for 3.3V devices
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.