Prusa i3 circular fan with inductive sensor support

by Mcknight, published

Prusa i3 circular fan with inductive sensor support by Mcknight Jan 16, 2016


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New improved version http://www.thingiverse.com/thing:2068697

This is a remix of mcleishn's " HICTOP fan nozzle cooler Filament". I really liked the design however I wanted to make some improvements for myself, Figured I should share :)


  • Added a mount for an inductive sensor 4mm to the side of the backet
  • Added some extra support to the bracket to make the arm attaching the vent stronger
  • Made the top layer of the circular duct bigger to remove holes in prints
  • Added bits of plastic inside of the circular duct to improve air flow and to act as a support for the top to help prevent print problems.

Blog post about it: http://blog.mkdev.co.uk/?s=Circular+fan+duct+for+Prusa+I3

Hope this is useful :)

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i have that same sensor what wiki did you use to setup and install the sensor?

inductive sensor pnp or npn?

What kind of fan mounts to this?

Its a 50mm x 15mm 12V DC Brushless Blower

The one for the Hictop prusa i3 is available on amazon:

However there are cheaper ones you can buy :)

What does the mount attach to on the extruder?

There is a metal plate behind the fan that the mount attaches too. What kind of printer do you have?

Folgertech 2020 i3.

just what i needed cheers buddy

Which sensor did you use (or what diameter)?

Sorry for the delay in my reply never saw this.. eeeeeeeek.

Anyway its 4mm, I forgot to add it to the description. I shall go ahead and add it now.

I am in the process right now of adding a 8mm sensor to my printer has I blew my sensor up the other day with a new design the mount that I'll release once I fix a few things :)