The CitiZ is a compact coffee-making gizmo. Opening it requires a proprietary tool that Nespresso doesn't sell. But iFixit has the answer: just use our oval head bit! They want to keep us out of our own machines!

You can even create your own specialty tool.

You can get into it with a pair of needle-nose pliers. The pliers I used aren't ideal — you want something that can get into the recessed slots.