This remote E3D v5 3D printer head (0.4 mm nozzle, 1.75 mm filament) is...
"1 Wire" 10 CM Male - Female
30 cm 1p Male to Female Wire
This M3x12mm hexagon pillar nut fits perfectly with the M3 hexagon pillars.
Adafruit Feather M0 Basic Proto - ATSAMD21 Cortex M0 has a free prototyping space on the board. Feather is a new development board series from Adafruit. As the name suggests, Feather boards are thin and light. Feather is designed to be a new standard for open source development platforms.