Clip-on Printrbot 40-mm Fan Mount, Version 2

by RockstarAlchemist, published

Clip-on Printrbot 40-mm Fan Mount, Version 2 by RockstarAlchemist Sep 1, 2012
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Based on some recommendations from pcarew (http://www.thingiverse.com/pcarew). I changed the following:

*Clip-on portion to extruder is now on the outside of the frame.

*I also opened the duct a bit more and allowed for more clearance from the bed.

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Hey, That's a delta high speed 40mm fan. If i recall correctly it draws just over 4 amps. So what i'm wondering is how are you powering it? Even high end PC motherboards headers are only rated for approximately 1 amp. Are you just turning it on / powering it manually and adjusting it with an external fan controller?

I ended up using a more traditional computer fan, but I don't recall the details. I've sense sold by Printrbot and looking for something else in the meantime.

Nice work! By any chance a version for the ones from us with 50mm fans? :-)

I dont really understand this housing - it blows straight down and its 3cm from the nozzle. further it causes so much back pressure that the fan barely blows out the nozzle which as i mentioned is blowing down and 3cm away from the hot end extrusion. what am i missing?

Nothing IMO, the one I made didn't do much for me at all.

wow. that was a waste of ABS. I am going to try and modify it (the physical thing, not the file) to get it to work. or just go back to having my fan mounted not with a nozzle - that was working ok.

I'm sorry you guys didn't get what you needed. The intent was not to blow air on the filament directly as it is extruded. The goal was to blow air on it after it was laid down. I was having issues with printed elements that were small and repeatedly had hot filament applied on top of them and them not being cooled prior to the next layer. Knowing what I know now, I could envision modifying the nozzle shape....I'll take a whack at it when I can.

That makes sense Rockstar. sorry to have been dismissive. i can see how the part was made for something specific. i actually printed it and modified it. i dont have the ability to edit STLs so i did it old school - with a band saw. :D i cut the end of the nozzle off, long enough it wouldn't hit the print bed and cut the fan holder off where it goes down at an angle so i could raise the fan up higher. the idea was to have a funnel that would basically point right at the point where its printing with perhaps 1cm of side blow on either side of the hot end tip. i was actually envisioning a system with a removable fan nozzle end: you can run it with the narrow end of the nozzle off to get wider blow and more power due to less back pressure, or press on the narrower part of the blower that aims right at the hot end tip for more localized cooling. can you do it???? :D

My calibration is just a tiny bit off and the clip doesn't hold any weight. So I joined two medium sized zip ties and threaded them behind the extruder body, under the forward lip of the bracket and ZIP. Seems to be holding nicely.

I also had to do the same, but I don't think its the calibration in my case.. its snug, but it still slips down. I did the same trick with the zip ties. I may try and make a clip later.

Jesus! that looks like a blow gun sizzling the ABS!

Looks awesome!  Do you use support material when you print this?

Thanx!!!...Nope....Just doped glass.