<p>I know nothing about 3D printing and I was wondering if it is a good candidate for what I want to make.</p>

<p>I want to make a custom game cartridge which looks like this:
<a href="https://i.stack.imgur.com/k0RpQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/k0RpQ.jpg" alt="enter image description here"></a> </p>

<p>Basically it's like a SD card in a custom shell. Now I can produce the inside as a thin PCB (0.6mm-1mm). But I was wondering what the best (and cheapest) way to prototype (and maybe make a small run production) the outer shell would be. The entire cart is about 2mm thick, so each half of the shell would be at most ~0.6mm thick.</p>

<p>Is this something I can do with a typical 3D printer? How would I "attach" the two halves together?</p>

With the experience I have with my 3d printer you can make (almost) everything you can draw with it.
0.6mm parts can be 3d printed but will not be very strong though.
For joining the 2 halves when they are so thin, I think the best solution is to glue them together. With the things I make for myself I mostly use small screws or small nuts and bolts but with 0.6mm parts I guess this wil not be possible.