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To add to what the others say, the loss of a blade will affect the fan balance, which will likely also affect the fan bearings detrimentally - remember that fans spin at around 2KHz and have tiny, tiny metal balls running in ABS races.
The balance problem may also hasten the departure of other blades, which will likely jam the fan and prevent it turning at all. If you leave the lappie alone for even a moment, turn it off until you have a new fan installed!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
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A bit like this...
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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"Fans spin at 2kHz" - you sure about that? 120,000 rpm?
"Love justice, you who rule the world". Dante.
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I like my computers really cool.
Or, I'm an idiot and made a mistake. I suspect the latter.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
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Simple kinda mistake. I tested a 40mm fan, 12V, using a magnet and Hall sensor. Got about 6,000 rpm (in free air).
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Tch! You know that accurate fan speed testing can only be done in a vacuum ... 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
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Bugger. And Ooooh! - it was in a gravity field - that 9.8m/s/s really screws things up. Forget I mentioned whatever it was we were talking about.
"Love justice, you who rule the world" -Dante Alighieri
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Peter_in_2780 wrote: "social" laptop
Yeah, let's call it that. 
Advertise here – minimum three posts per day are guaranteed.
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Very strange: why is it "on dusty laps" so much that it needs surgery ? Buy a desk, or workstand that covers the lap ?
«The mind is not a vessel to be filled but a fire to be kindled» Plutarch
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My laptop vendor gave me the hint that apparently the Eco program in the dish washer does work to remove dust, just make sure you leave the screen open and place it in the lower basket.
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Well, you're "running" it in reverse and it won't have been designed for that. But if the motor has permanent magnets, you're also generating current by blow-running it at any significant speed. The fan may survive over-speed, but the electronics it's connected to - even/especially if the machine is powered off, may not. 
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I will echo what Bill wrote. It is a good idea to get a little lap pad for the computer to sit on when not on a desk. That insures the fans are unobstructed so they can do their job.
Here are the products Amazon has : Amazon Laptop Desk[^]
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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those work for laptops. have feet and some little fans.
"A little time, a little trouble, your better day"
Badfinger
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I had the heatsink work partially loose on my desktop, and as a result the CPU temperature rose to around 100C. But I reseated the heatsink and it's still soldiering on, tough old birds, these chips.
Paul Sanders.
If I had more time, I would have written a shorter letter - Blaise Pascal.
Some of my best work is in the undo buffer.
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I've had a Framework laptop for a few months now for personal use. I chose it because so many of the design choices were for simplifying maintainability and upgradability (sp?).
As an example getting to the fan to clean it - or even replace it is simple. And the same for other components. e.g. Heatsink and Fan Replacement Guide - Framework Guides[^]
I also go the lap desk route, one with a lift so the underside of the machine is always clear.
So far it is so new that I haven't needed to clean it yet. Time will tell.
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I take my desktop outside every 6 months and blow out the case. I learned (the hard way) to NOT do it in the house. I also learned to stick a bamboo skewer in each fan before blowing air on it, as it's very possible to overtorque a fan and break it.
While on the subject of desktops, my current case has the power supply on the bottom. DO NOT buy one, as they suck up every bit of dust on the floor. I built a stand for it, so the case is 8" (20cm) off the floor -- this cut dust accumulation by 75%.
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I usually use freeze spray canned air to push out the bunnies (keeping a greater distance to avoid too much freeze). Other things I have seen work have been photography cleaning tools and puffers - and they have a laptop vacuum which has a finer tip - so you can control where the suck comes from better.
Many years ago - where I worked, we cleaned an entire PC in the freon bath I had access to. While it works great - I don't think you can do this anymore. It is apparently not good for the environment.
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Wordle 570 6/6
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Quote: Wordle 570 4/6
⬜⬜🟩⬜⬜
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🟩🟩🟩🟩🟩
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Wordle 570 5/6
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Wordle 570 5/6
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Wordle 570 3/6*
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"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Wordle 570 6/6
🟨⬜🟩⬜⬜
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Wordle 570 6/6*
🟩🟩⬜⬜⬜
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🟩🟩🟩🟩🟩
Just made it!
Happiness will never come to those who fail to appreciate what they already have. -Anon
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