Tusk cooling for Duet smart effector

thingiverse

The [Duet Smart Effector] is a nice upgrade to a plastic effector. Nozzle-based probing, guaranteed-precise dimensions, built-in lights, and easy-to-detach cables make it an excellent choice for delta printers. However, the provided 40mm fan shroud did not generate enough cooling with my 40mm fan, and axial fans are known to be less effective for part cooling. I saw the [Tusk Fan Shroud blog] and wanted to try the concept using a 40mm x 20mm blower fan. This design carefully considers three key factors: - Minimizing any loss to printable area incurred when fan parts stick outside of the effector triangle: these parts stick out just a few mm and probably can't get any smaller without changing the E3D fan duct or using a different blower fan. - Maximizing clearance from the bottom: for better visibility, as well as clearance from bed-mounting screws, there is about 2mm of clearance now. - Using a minimum of material: the fan body is used in a structural way. **Parts Needed** - 3x M3x20mm BHCS - 4mm Al tubing for tusks **Instructions** - Print one of each part - Go slow with the tusk shroud, as it needs good cooling; also, flip it so the bottom side is on the build plate (should have no overhangs) - Same for the fan mount - Print the tusk drill jig from here: https://www.thingiverse.com/thing:2445660 - Create your tusks; I crimped mine with a PCB vise and used a hacksaw and sandpaper - Enlarge the holes in the tusk mount to exactly 4mm, so that the tusks stay in place but can be rotated - Form the screw threads for the tusk clip retaining screw, then attach these two together - Attach fan to mount - Remove effector screws and add the mount; the holes are placed to where the edge of the fan acts like a nut trap - Tune part cooling settings For extra clearance, I used smaller-head button-head cap screws (BHCS) instead of socket-head cap screws (SHCS) for the fan mount and the tusk mount. In practice, the blower fan is not the quietest but it does seem to work well enough. If starting from scratch, I would seek out a smaller 40mm or quieter 30mm blower fan to eliminate the few mm of lost printable circle, plus also to maybe get some more airflow. **Fusion360 Sources** [Effector Fan Mount](http://a360.co/2lbt34i) [Tusk Duct Bottom](http://a360.co/2zzRU72)