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40mm extruder cooling fan

by erossman, published

40mm extruder cooling fan by erossman Oct 17, 2012

Description

Printrbot compatible extruder fan duct and mount. This fan duct primarily cools the hot extruded thread. This ducting provides some additional cooling for the extruder collar/mount as well. Design DOE's and optimizations by me. The wonderful CAD work on these were provided by my friend Eric D., as he is so much faster at CAD work than I am.

Recent Comments

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I also would love an 50mm version :-)

I used small self tapping screws, I added extra wall thickness in the design for this.

I've printed this, and it looks nice. I'm probably being stupid, but can't figure out how to attach the fan. Do I use self tapping screws? Not sure how to keep the nuts on inside the duct.

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Instructions

I have three variations of Extruders for my project that I used for fit during this design. The duct mount is meant to fit between your x-carriage mount and your extruder drive. You can attach the fan ducting on the top or bottom of the mount tabs to fit your exact dimensions. The primary cooling output is meant to cool the hot extruded output and not the nozzle. Assure that the ducting does not extend below the extruder nozzle. The secondary cooling output (to the extruder collar/mount)is optimally spaced to be within a half of an inch (~13mm).

Support ribs were specifically incorporated into the design to allow non-cooled printing of these parts, control flow, and to provide additional strength to the ducting.

Enjoy :)

Comments

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osbock on Aug 7, 2013 said:

I've printed this, and it looks nice. I'm probably being stupid, but can't figure out how to attach the fan. Do I use self tapping screws? Not sure how to keep the nuts on inside the duct.

erossman on Aug 8, 2013 said:

I used small self tapping screws, I added extra wall thickness in the design for this.

flintols on Jul 19, 2013 said:

Great design work, looks lie you thought hard about it :)

elso on Mar 15, 2013 said:

Can aou upload a 50mm version?

3runo on Sep 9, 2013 said:

I also would love an 50mm version :-)

eflyersteve on Mar 14, 2013 said:

This was probably obvious to everyone else, but don't print this with PLA - it will soften and sag in use from the heat of the hot end.

I've printed two of the brackets now - one in PLA and one in ABS and you don't need the supports (I removed them because they were not printing on the first layer and causing issues).

erossman on Mar 23, 2013 said:

Not so, I have had no problem using this part printed out of PLA. And I am printing polycarb @ 230°F. I run an insulated hot end though. My testing has shown that the fan shroud is just as effective at 13mm as it is at 3mm, so you could try increasing your spacing from the hotend. My current problem is the flow is uni directional to the part making single wall shells a challenge. I am looking to rework this fan shroud mount to give the option of mounting two fans. Thank you for your feedback

Eirinn on Feb 21, 2013 said:

OK, just made one.

I have a few comments:
The added support (thank you!) is not, at the first layer, connected to the base. My extruder knocked some of them over that sticked to the extruder head. It printed OK though.

The duct is printable without a fan, but I had some layers split... it's usable but i think I'll use this one to print another if it works well :)

erossman on Feb 21, 2013 said:

The legs of the breakaway supports can be improved with some additional brim. I will see about adding a base layer to help the supports print better as well. Thank you for your feedback. :)

Eirinn on Feb 20, 2013 said:

Will this fit a printrbot plus? :)

puzzler300 on Jul 19, 2013 said:

I printed mine on a plus, And mounted it. fits just fine

erossman on Feb 20, 2013 said:

I believe that the exact same hotend and extruder are used throughout the printrbot model lineup.

-Eric :)

Thugorp on Jan 6, 2013 said:

For what machine is this meant? does it work with laser cut extruder rigs?

erossman on Oct 18, 2012 said:

On the mount bracket, my solid infills for the 45degree tabs are being fickle. I would suggest adding support structure when slicing the mount. I will have an update soon

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