This is a replacement key for the Korg Nanokey 2. I don't know how exactly I managed to lose this key, but once I did I was unable to use the keyboard at all and I couldn't find a source to buy a replacement, so I made my own!

There's another attempt at this up here on Thingiverse, but that didn't work for me. The measurements were off and it was missing the little tabs that hold the key on.

I spent some time getting this to fit correctly. All the little bits on the underside of the key are quite small and fiddly. But after some tweaking of my initial design it pops on pretty easily and seems to hold firm. It is a tiny bit more wobbly than the standard keys but works pretty great for me.

Hope this helps someone else in a similar predicament!