Pen holder for the Anet A8 and other Prusa i3 derivatives. Screws in place of the extruder motor fan.
Max pen diameter: 12mm
Screw the pen in place with M3 screws and nuts.
v3: Two screws instead of one to hold the pen for better stability.
v2.1: Better spacing of screw holes.
v2: Puts the pen closer to the nozzle.