Melodicade MX-DIY, 3D printed, MIDI keyboard with velocity sensitivity [video] (youtube.com)

Thought this was a really interesting example of DIY spirit and might be well liked here. Couldn't fit everything into the title but it's also using an atypical key layout (Wiki-Hayden)

https://en.wikipedia.org/wiki/Wicki%E2%80%93Hayden_note_layo...