Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

40mm Ducted Fan Shroud

by Kidlatj, published

40mm Ducted Fan Shroud by Kidlatj Feb 5, 2012
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40mm fan ducted shroud for the prusa mendel with Lm8uu's and a J-head extruder. this has a flap inside that can adjust the amount of air to the hotend. It snaps in place between the LM8UU brackets but some additional doublesided tape or whatever might also be desired. the hotend duct lines up with the vents on the J-head mk4 extruder while the other duct shoots down evenly around the extruder (missing the nozzle) onto the freshly placed plastic. This is great for sagless bridging and sharper corners on your prints.

Update: Adjustable Damper added (see section view) also created a version that mounts to the Slim x-carriage at http://www.thingiverse.com/thing:16208

Update 2: Added a larger diameter vent version that will fit the Prusa V2 carriage and larger sized extruders. I also included the source Revit file.


there is a smallish tab that can optionally come off that is needed to help bridge the gap on the inside fan opening. There is some crazy bridging going on so I suggest using a fan. This is my first upload here, this part was created in Revit and 3ds Max and for some reason Skeinforge complains about it a little bit but it still prints just fine.

Update: The added internal damper can use a short section of 3mm filament as the hinge pin or substituted with a nut/bolt.

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Anybody have one like this for the Prusa i3? This would work great for the Magma hot end.

Having lots of problem exporting from Revit.

How do you do it?

STL Exporter changes size and most important makes STLs files that never works, as it tries to start ptinting not at Zero Z level...

I'll try wih your family RFA.

Anyone else having problems slicing this with slic3r? it comes out all messed up! i can even import it to an STLl viewer and have it come up looking right. Any help?

Same problem here, looks ok when I look at the stl. Slic3ing it fails for the top half or so.

Slic3d ok for me. When I open up the file in solidworks its a bit weird tho. The part is half solid, half surfaces but its still the correct shape.

Any possibility of slimming the slim version down by 3mm? I am using Jonas Kuehling's reinforced version of the slim carriage, meaning there is 3mm less space between bearing clamps. I am unfamiliar with Revit. Is it free?

this would be very useful!

Is this the one? Let me know and I can make it for you if you are still interested. -sorry for the delay :)

Reinforced Prusa X Carriage with Slim LM8UU Holder
Prusa X Carriage with Slim LM8UU Holder and Two Fan Mounts
by Pacca

It looks great -- I just need to work on my print quality a bit more. lol

It looks like this was made for the original V2 X carriage, but there's a newer V2 carriage on github that has only three LM8UU brackets with no snap fit. Do you have any plans to update for that x carriage?

Same problem... But as Kidlatj has posted the source it should be no problem. The new carriage has 6 holes for mountig the extruder, it shoud be possible to use 2 or all 4 of the unused holes to mount the fan there. Just have to redraw the fan shroud that these holes become accessible... Unfortunately I have no time at the moment to do that. Maybe someone else?

Would you mind to post your design file? Need a somewhat bigger hole around the noozle....

I went ahead and created one with a larger diameter for you. I also included the source file in case you have any experience using Revit...

Nice, thanks. Will try it. How large is it?

Just uploaded a pic of the dimensions of the Large model. Let me know how it works!

Skeinforge seems to have some weirdness in mine and skips a few lines on the top for some reason. Not sure why, but remember to check your layers BEFORE printing unlike me!

Looks like a really well designed part. I am having trouble visualising how it attaches to the x-carriage, any pictures of it fitted?

just added a new pic, it fits between the two LM8UU brackets along the x axis. I will have some more pics as soon as i get it mounted.

Thanks. I am guessing that this is an untested piece up to now? I look forward to seeing the results. :)

SWEET, printing next...