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40mm Fan CFM? (need replacement)
Posted: Tue Dec 16, 2014 7:51 pm
by sthone
So I stuck a screwdriver in my 40mm Fan last night and sheared off a few blades and I'm trying to source a new one locally to get back up running asap.
Does anyone know what the CFM's of the stock fan are? I found a few options locally.... both are 12v but but one says its 7.7 CFM and the other is 32.4 CFM (that seems like a lot) or is it even that that important as long as its blowing something?
-Steve
Re: 40mm Fan CFM? (need replacement)
Posted: Tue Dec 16, 2014 8:58 pm
by jdacal
I couldn't find specs for that exact fan, but most of the one's pulling 0.06amps like the M2 fan seem to be rated between 4-5 CFM. So the 7.7CFM would be closest to that.
Re: 40mm Fan CFM? (need replacement)
Posted: Tue Dec 16, 2014 10:00 pm
by jimc
32.4 haha i dint think there is any way you going to get that out of a 40mm fan. Thats about what a 80-90mm fan puts out. Sounds like some marketing bs to me. Like jdacal said, 7 seems right so any where in there.
Re: 40mm Fan CFM? (need replacement)
Posted: Tue Dec 16, 2014 10:01 pm
by jdacal
Must be a Dyson
Re: 40mm Fan CFM? (need replacement)
Posted: Tue Dec 16, 2014 10:11 pm
by sthone
jimc wrote:32.4 haha i dint think there is any way you going to get that out of a 40mm fan. Thats about what a 80-90mm fan puts out. Sounds like some marketing bs to me. Like jdacal said, 7 seems right so any where in there.
Yeah now that you mention it the bathroom fan I just made an airbrush spray booth out of was 50 CFM so I'm guessing that it's a typo in the listing. Either way thanks guys I have I general idea now when I stop by the store later tonight.
-Steve
Re: 40mm Fan CFM? (need replacement)
Posted: Tue Dec 16, 2014 10:24 pm
by benavery
Be aware the at the connectors are non-standard for 40mm fans, which will typically have PC hookup connectors on them (at least, from what I have seen)
If your current fan is dead, you can salvage the connector from that one though and do some re-soldering yourself.
Re: 40mm Fan CFM? (need replacement)
Posted: Wed Dec 17, 2014 4:17 pm
by sthone
Just a follow up encase someone else ever has to replace a fan. The new fan I used sounds like it has a higher CFM (pushes more air) that the stock one. If you change a fan do pay attention to your next few prints as you temp setting may need to be changed. I started a print using the same setting I always use and the first few layers looked a little funny so I increased the extrusion a bit and this seemed to help. I thought this was because I just cleaned out a slight clog and maybe didn't get it all but I then came back a while later and noticed I had a problem with layer separation too in a few places. I bumped up the temp on the fly and that seemed to go away also I'm guessing that the higher output of the new fan is causing lower temps in the hot end. I could be totally wrong but it's something to look out for if you change a fan.
-Steve