Sphinx Fan shroud for Bulldog XL extruder

Fits a 40 mm fan, makes the air wrap all around the print head for much cleaner results. Could be adapted for other kinds of printers but I made it for my Repstrap Monkey S#*t Fight that uses a Bulldog XL geared extruder.

3D printer parts and enhancements

Creative Commons Attribution Share Alike

Commercial use is allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.

Learn more or download attribution tags


My Bulldog XL is mounted as direct drive and it works great but my lack of cooling was really screwing up my ability to bridge gaps and work on small areas without melting the layers underneath. It sucked. The fan I mounted was blocked by the print head and anything behind it would still be too soft by the next layer. I built this shroud to split the air and funnel it behind the print head. It has internal baffles and geometry to make the air angle down under the head to cool the plastic without cooling the nozzle. It also diverts part of the air that would come right out the front to the back for more even airflow. Prints in one part with no support or gaps to bridge, a very easy print. Holes are undersized so you can drill them out to a size your hardware will thread into. No nuts needed if you do it right. Light weight, nice clearance and it kinda looks like the Sphinx, so that's cool. Mounting plate for the Bulldog is included. You will have to offset it because the Bulldog feeds slightly to one side. Or redesign the mount as you see fit. 32mm on center 2mm holes.

Materials and methods

Printer, plastic, a couple machine screws.



See all issues or open a new issue


Mini img 8016Peterthinks commented ago

Turns out part of this was kinda inside out... I fixed the file and re uploaded it. Slicer caught the mistake when I first printed it so I never noticed but it's fixed now.

1a58c0a41f54c100aa59da89007bc1c0?default=blank&size=40Michael Conradt added this to the Things to print collection ago
Mini img 8016Peterthinks published this design ago