Extrudercooler mk3/mk3s

thingiverse

Extruder Coolers for Prusa MK3 and MK3s. Printing PLA can result in misprints due to insufficient filament extrusion, a problem that was not encountered with my previous MK2s. Observing the filament within the extruder revealed it had been shaved down to a smaller diameter by the gears on most occasions. I theorize that the extruder motor overheats, particularly when printing with PLA at temperatures above 60 degrees. Consequently, during longer phases of non-extrusion, the PLA softens and the gears can no longer securely grip the filament. The heat from the motor is transferred to the gears via the axis. This issue occurs when temperatures rise, such as during lengthy prints or hotter summer temperatures in the room, especially with an enclosure for sound dampening. Using the extruder cooler reduces the motor temperature by approximately 15-20 degrees, thereby resolving the problem of PLA misprints caused by non-extrusion on my MK3. However, this issue recurred when switching to the MK3s, prompting me to design a version specifically for the MK3s. The extruder cooler also serves as a lightweight vacuum, minimizing debris from reaching the optical filament sensor. A 40x40x20 or 40x40x10 Noctua fan is used, but other fans will work equally well. The cooler draws power from J7 connector on the Einsy board at 5V via an extra cable that I had embedded during initial builds "just in case." It may be possible to attach it directly to the heatsink fan in parallel.