×Read this message from Erik, founder of YouMagine

Better fan duct for Electron3d Prusa i3 printer

This is meant to be a direct replacement for the kit fan duct, blowing air all around the nozzle. The default dimensions are for my setup (homemade heater block and nozzle), but I'm including the scad file, so one could change it for other mounts / sizes, if needed.

3D printer parts and enhancements


A free software license that requires that all work based on this must also be free software as in freely remixable and sharable by anyone under the same license but may be used commercially.

Learn more or download attribution tags


Edited to add an improved version (after some tests) + a variant with built-in support for people stuck with Cura.

If you got suckered by the 3dprintersonlinestore fake sale and bought one of these, the fan-duct-flavour-of-the-week they provide is generally pretty inadequate: far away from the nozzle, blowing from one direction so air might not get to the far side of the print.

Print Instructions

You will need support for the bracket.

I printed mine out of PLA, 190 degrees, 60% infill (there's not much of it), 0.8mm wall thickness (to match the model), 50mm/s, with support ("touching buildplate" in Cura)

I guess Colorfabb XT or ABS might be more advisable as they take heat better, but I have no ABS and XT is so damn expensive and I was just experimenting... anyway, the thing has been in use for hours without an issue.

As a side note, cura's support structures are atrocious, maybe a better slicer would be advisable (or one could separate the bracket from the duct, devise a way to clip them together and print them separately...)

Materials and methods

- printed fan duct
- 51mm blower (comes with the printer)
- 2 M3x20 screws (come with the printer)



See all issues or open a new issue


Aa67733242d53e5e760be1368af51dde?default=blank&size=40Alexandr Sollo added this to the to make collection ago
2577c6bcc26416c0621103c98211fefd?default=blank&size=40Sugimori added this to the Duct collection ago
Deedd04085c81d880be3195ff3866a76?default=blank&size=40Thiago Marques de Oliveira Goes Goes added this to the Printer collection ago
977a9bc28d74e3c161922556fc2b771e?default=blank&size=40Falk Chaurasia added this to the mystuff collection ago
3ae073b4815204de4d87f5ea83313c3c?default=blank&size=40benjabr added this to the 3D-Printer collection ago
884da937c3003f768482a1326c6467b2?default=blank&size=40enry68 added this to the Prusai3 collection ago
Mini imageRflynn commented ago

Why my fan never comes on? Only when I pre heat it.

Mini imageRflynn added this to the 3D printers collection ago
29e420375c0441efd861fbe20925e8ed?default=blank&size=40vrillusions added this to the Things to Print collection ago
20698ef54c0fb68d1412dd5973f3a6d4?default=blank&size=40Dave Dyck printed this ago
Carousel thumb img 1431
Printed on:
Geeetech I3 X Prusa
Turned out Fantastic!
It does not actually fit My Geeetech as is but I am working to modify it. I know it will work well for me in the end! Thanks for the great Design and your hard work. Dave
20698ef54c0fb68d1412dd5973f3a6d4?default=blank&size=40Dave Dyck added this to the mine collection ago
6466941951b2391e744c3ec2b77d8f8c?default=blank&size=40hrlyrdr79 added this to the blower 4 extruder collection ago
6bb8d440fcffb10b9eb8a9f8298656cc?default=blank&size=40Volandzel added this to the New collection ago
Af3eda0a32020861acacddecef8fca96?default=blank&size=40Joerg Gebhard added this to the GJ collection ago
32fa99186a0f3d8a14841248340317d8?default=blank&size=40lgdidier added this to the printer collection ago
25c058d105286af6f6ab566c6096c578?default=blank&size=40Taz Manian added this to the 3D Printer Parts collection ago
Mini poza cdn patrataSabin Iacob published this design ago