Trinus Extruder Cooling Fan Shroud

thingiverse

**8/16/2017 - Updated design at https://www.thingiverse.com/thing:2482344** I faced a problem with filament softening in the extruder housing and bending, which caused jams. Kodama opted to attach the parts cooling fan to the extruder cooling fan, resulting in insufficient airflow through the extruder. This shroud positions a fan to draw air through the extruder housing and out the side exhaust. It's still a work in progress; the shroud needs a piece of velcro on top of the extruder housing and under the hook to stay in place. Creating a bow in the hook and extending the sides around the extruder housing will fix that, but I won't have time for it right now, so I'm using velcro instead. Using the shroud while printing a model that fills the entire bed showed me that wires from the extruder need to be routed over the output end of the fan using wire ties, as shown in the new picture above. Since I'm using a low-velocity fan, it doesn't impede airflow significantly. If the wires are routed on the axis side of the shroud, they can catch on the end of the axis. If routed on the outside of the shroud, they overstretch the wire connections. I've also used wire ties to minimize pulling on the connectors at the PCB end. Future versions will include wire management clips to avoid this issue altogether.