Ender 3 - Fresh Air System for Melzi Board v1.0

#Ender 3 - Fresh Air System I got big heat problems with my "Melzi-Board" inside my "Ikea Lack" enclosure for the Ender 3. It can reach up to 40-50°C inside the enclosure, especially @printing with ABS!! And this is my solution for this problem! #Notes: - The grommet lengh fits for a "Ikea Lack" table. - The grommets outer diameter is Ø32mm - Tube holder is optional (i got a problem with the electric cable pipe cause its very inflexible and often crashed into the heatbed), this